## GeMS validation of LITTL2025.1.gdb

File written by GeMS_ValidateDatabase.py, version of 02/19/2025
Wed Dec 31 18:48:41 2025
Runtime parameters
Database path: \MD_2022_Littlestown2025.1_2-submittal\MD_2022_Littlestown2025.1_1-2\MD_2022_Littlestown2025.1_1-2-database\LITTL2025.1.gdb
Output directory: \MD_2022_Littlestown2025.1_1-2-submittal
Metadata file: None
Check embedded metadata: False
Skip topology check: False
Refresh GeoMaterialDict: False
Delete extra rows in Glossary and DataSources: False
Compact GDB: True
This database is LEVEL 3 COMPLIANT.
Check Metadata option was skipped. Be sure to have prepared valid metadata and check this option to produce a complete report.
This file should be accompanied by Littlestown.gdb-ValidationErrors.html and a metadata summary from mp in the same directory.
If this database will be submitted to the NGMDB, it also needs to be accompanied by a reviewed Geologic Names report that includes identification of any suggested modifications to Geolex. Use the Geologic Names Check tool to generate that report or provide other documentation of a review.
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### Contents

Compliance Criteria
Warnings
Content not specified in GeMS schema
Occurrence of MapUnits in DMU, feature datasets, or geopackage tables
Contents of Nonspatial Tables
DataSources
DescriptionOfMapUnits
Glossary
Database Inventory

### Compliance Criteria

#### LEVEL 1

Criteria for a LEVEL 1 GeMS database are:

- No overlaps or internal gaps in map-unit polygon layer
- Contacts and faults in single feature class
- Map-unit polygon boundaries are covered by contacts and faults lines

Databases with a variety of schema may meet these criteria. This script cannot confirm LEVEL 1 compliance.

#### LEVEL 2--MINIMALLY COMPLIANT

A LEVEL 2 GeMS database is accompanied by a peer-reviewed Geologic Names report, including identification of suggested modifications to Geolex, and meets the following criteria:

2.1 Has required elements: nonspatial tables DataSources, DescriptionOfMapUnits, GeoMaterialDict; feature dataset GeologicMap with feature classes ContactsAndFaults and MapUnitPolys | PASS
2.2 Required fields within required elements are present and correctly defined | PASS
2.3 All MapUnitPolys and ContactsAndFaults based feature classes obey Level 2 topology rules: no internal gaps or overlaps in MapUnitPolys, boundaries of MapUnitPolys are covered by ContactsAndFaults | PASS
2.4 All map units in MapUnitPolys have entries in DescriptionOfMapUnits table | PASS
2.5 No duplicate MapUnit values in DescriptionOfMapUnit table | PASS
2.6 Certain field values within required elements have entries in Glossary table | PASS
2.7 No duplicate Term values in Glossary table | PASS
2.8 All xxxSourceID values in required elements have entries in DataSources table | PASS
2.9 No duplicate DataSources_ID values in DataSources table | PASS

#### LEVEL 3--FULLY COMPLIANT

A LEVEL 3 GeMS database meets these additional criteria:

3.1 Table and field definitions beyond Level 2 conform to GeMS schema | PASS
3.2 All MapUnitPolys and ContactsAndFaults based feature classes obey Level 3 topology rules: No ContactsAndFaults overlaps, self-overlaps, or self-intersections. | PASS
3.3 No missing required values | PASS
3.4 No missing terms in Glossary | PASS
3.5 No unnecessary terms in Glossary | PASS
3.6 No missing sources in DataSources | PASS
3.7 No unnecessary sources in DataSources | PASS
3.8 No map units without entries in DescriptionOfMapUnits | PASS
3.9 No unnecessary map units in DescriptionOfMapUnits | PASS
3.10 HierarchyKey values in DescriptionOfMapUnits are unique and well formed | PASS
3.11 All values of GeoMaterial are defined in GeoMaterialDict. GeoMaterialDict is as specified in the GeMS standard | PASS
3.12 No duplicate _ID values | PASS
3.13 No zero-length, whitespace-only, or bad null values | PASS

### Warnings

There are 0 warnings

### Content not specified in GeMS schema

Some of the extensions to the GeMS schema identified here may be necessary to capture geologic content and are entirely appropriate. Please document these extensions in metadata for the database, any accompanying README file, and (if applicable) any transmittal letter that accompanies the dataset. Other extensions may be intermediate datasets, fields, or files that should be deleted before distribution of the database.

#### Fields

#### Tables

### Occurrence of MapUnit in DMU, feature datasets, or geopackage tables

MapUnit | DescriptionOfMapUnits | GeologicMap
--- | --- | ---
CZicp | X | X
CZu | X | X
Trn | X | X
CZisr | X | X
CZisp | X | X
Jd | X | X
CZscb | X | X
Qt | X | X
Qal | X | X
CZus | X | X
Trns | X | X
CZmbs | X | X
CZiq | X | X
CZimp | X | X
CZmb | X | X
Trni | X | X
CZitp | X | X

### Contents of Nonspatial Tables

#### DataSources

OBJECTID | Source | Notes | URL | DataSources_ID
--- | --- | --- | --- | ---
6 | Neuendorf et al., eds., 2011 | modified from Neuendorf, K.K.E., Mehl Jr., J.P., and Jackson, J.A., eds. 2011. Glossary of Geology (Fifth Edition, Revised). Alexandria, VA. American Geological Institute. 783 p. | https://www.americangeosciences.org/pubs/glossary | AGI_2011
5 | FGDC, 2006 | Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. | https://ngmdb.usgs.gov/fgdc_gds/geolsymstd.php | FGDC-STD-013-2006
4 | definitions copied from GeMS, 2020 | U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema)—A standard format for the digital publication of geologic maps: U.S. Geological Survey Techniques and Methods, book 11, chap. B10, 74 p., https://doi.org//10.3133/tm11B10. | https://pubs.usgs.gov/publication/tm11B10 | GeMS_2020
18 | Kunk, M.J., Froelich, A.J., and Gottfried, David, 1992 | Kunk, M.J., Froelich, A.J., and Gottfried, David, 1992, Timing of emplacement of diabase dikes and sheets in the Culpeper basin and vicinity, Virginia and Maryland-40Ar/39Ar age spectrum results from hornblende and K-feldspar in granophyres [abs.]: Geological Society of America Abstracts with Programs, v. 24, no. 2, p. 25. | https://www.geosociety.org/GSA/GSA/Events/find-abstracts.aspx | GSA_AWP1992_24.2.25
19 | Maryland State, MD iMAP | Maryland State, MD iMAP Data Catalog (DoIT), Maryland Physical Boundaries - County Boundaries (Detailed), publ. 2016-02, updated 2019-09, accessed 2024-09. | https://geodata.md.gov/imap/rest/services/Boundaries/MD_PhysicalBoundaries/FeatureServer/0 | IMAP_PB_CBD_2016
12 | Jonas, A., 1928 | Jonas, A., 1928. Map of Carroll County showing the geological formations. Maryland Geological Survey, County Geologic Map, scale 1:62,500. | http://www.mgs.md.gov/publications/maps.html | MGS_CLGEO1928
3 | Brezinski, D.K., field observations | Brezinski, D.K., field data collection and interpretations | None | MGS_DKB
11 | Edwards, J., Jr., and Glaser, J.D., 1993 | Edwards, J., Jr., and Glaser, J.D., 1993. Geologic map of the Littlestown Quadrangle, Carroll County, Maryland: Maryland Geological Survey, open-file map, scale 1:24,000. | http://www.mgs.md.gov/publications/maps.html | MGS_LITTL1993
2 | Brezinski, D.K., 2025 | this report | http://www.mgs.md.gov/publications/maps.html | MGS_LITTL2025.1
14 | Reger, J.P., Brezinski, D.K., Southworth, S., & Quinn, H.A., 2004 | Reger, J.P., Brezinski, D.K., Southworth, S., and Quinn, H.A., 2004. Geologic Map of the New Windsor Quadrangle, Carroll County, Maryland. Maryland Geological Survey Digital Geologic Maps, NEWWIGEO2004.1, scale 1:24,000. | http://www.mgs.md.gov/output/maps/quadgeo/NEWWIGEO2004_1.pdf | MGS_NEWWI2004.1
7 | Brezinski, D.K., Reger, J.P., Southworth, S., and Vincett III, W.K., 2024 | Brezinski, D.K., Reger, J.P., Southworth, S., and Vincett III, W.K., 2024, Revised Geologic Map of the New Windsor Quadrangle, Carroll and Frederick Counties, Maryland: Maryland Geological Survey, Quadrangle Geologic Map, scale 1:24,000 (version NEWWI2024.1). | http://www.mgs.md.gov/publications/maps.html | MGS_NEWWI2024.1
10 | Edwards, J., Jr., 1986 | Edwards, J., Jr., 1986. Geologic map of the Union Bridge Quadrangle, Carroll and Frederick Counties, Maryland: Maryland Geological Survey, scale 1:24,000. | http://www.mgs.md.gov/publications/maps.html | MGS_UNION1986
13 | Reger, J.P., and Edwards, J., Jr., 2006 | Reger, J.P., and Edwards, J., Jr., 2006. Geologic Map of the Union Bridge Quadrangle, Frederick and Carroll Counties, Maryland. Maryland Geological Survey Digital Geologic Maps, UNIONGEO2006.1, scale 1:24,000. | http://www.mgs.md.gov/publications/maps.html | MGS_UNION2006.1
8 | Brezinski, D.K., Southworth, S., and Edwards, J., Jr., 2004 | Brezinski, D.K., Southworth, S., and Edwards, J., Jr., 2004. Geology of the Walkersville Quadrangle, Frederick County, Maryland. Maryland Geological Survey Geologic Map, scale 1:24,000. | http://www.mgs.md.gov/publications/maps.html | MGS_WALKE2004.1
17 | Fisher, G.W., 1978 | Fisher, G.W., 1978. Geologic map of the New Windsor Quadrangle, Carroll County, Maryland. US Geological Survey. IMAP 1037 | https://pubs.usgs.gov/publication/i1037 | USGS_NEWWI1978

#### DescriptionOfMapUnits

OBJECTID | MapUnit | Name | FullName | Age | Description | HierarchyKey | ParagraphStyle | Label | Symbol | AreaFillRGB | AreaFillPatternDescription | DescriptionSourceID | GeoMaterial | GeoMaterialConfidence | DescriptionOfMapUnits_ID
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
1 | Qal | Alluvium | Alluvium | Quaternary | Grayish brown, light brown to reddish tan, poorly sorted, coarse to fine sand, silt, and clay with localized lenses of subrounded vein quartz cobbles. Locally, chips and angular cobbles of local bedrock are included. Thickness of this material ranges from a thin veneer up to 10 feet (3 meters). In smaller tributary streams alluvium has not been shown, but may still be present as a thin veneer overlying a bedrock channel. | 01-01 | DMU Unit 1 | Qal | 40 | 255,255,179 | None | MGS_LITTL2025.1 | Alluvial sediment, mostly coarse-grained | High | DMU001
2 | Qt | Terrace Deposits | Terrace Deposits | Quaternary | Reddish orange to light brown, sandy, clayey gravel with subrounded cobbles of quartz and local bedrock. Commonly occurs as a thin veneer that covers low-lands adjacent to present flood plains. Most extensively developed along Big Pipe Creek and Silver Run Creek. Thickness ranges from 0 to 10 feet (3 meters). | 02-01 | DMU Unit 1 | Qt | 71 | 255,235,102 | None | MGS_LITTL2025.1 | Alluvial sediment, mostly coarse-grained | High | DMU002
3 | Jd | Jurassic dike(s) | Jurassic dike(s) | Jurassic | Massive, medium to dark gray, fine- to medium-grained diabase, weathering orange brown. Occurs in dikes marked by rows of large, rounded, residual diabase boulders in the soil and at the surface. These dikes may be continuous and are shown as such. The age of the dikes in central Maryland and northern Virginia is early Jurassic (Kunk et al., 1992). | 03-01 | DMU Unit 1 | Jd | 01.03.02 | 255,0,0 | None | MGS_LITTL2025.1|GSA_AWP1992_24.2.25 | Coarse-grained, intermediate-composition intrusive igneous rock | Medium | DMU003
4 | Trn | New Oxford Formation | New Oxford Formation | Triassic | Interbedded pinkish gray, very coarse-grained, pebbly, trough cross-bedded, argillaceous, arkosic sandstones and reddish brown, silty rooted mudstone and laminated siltstone. Some reddish gray to gray arkosic sandstone (Trns) also occurs near the base of the formation. Sandstone vary from 5 to 15 feet in thickness, while siltstones range from 1 to 6 feet (30 cm- 2 m). Shales and mudstones are intensely rooted or fractures by closely spaced mudcracks that obscures primary bedding. The New Oxford Formation is best exposed in bluffs along Big Pipe Creek. Estimated thickness of the unit is about 1,000 feet (~300 meters). | 04-01 | DMU Unit 1 | ^n | 510 | 153,255,235 | None | MGS_LITTL2025.1 | Sandstone and mudstone | Medium | DMU004
5 | Trns | arkosic sandstone | arkosic sandstone subunit of the New Oxford Formation | Triassic | Reddish gray to gray arkosic sandstone (Trns) occurring near the base of the New Oxford Formation. | 04-01-01-01 | DMU Unit 3 | ^ns | 621 | 128,235,222 | None | MGS_LITTL2025.1 | Sandstone | High | DMU005
6 | Trni | Irishtown Member | Irishtown Member of the New Oxford Formation | Triassic | Localized massive to thick-bedded, grayish red conglomerates interbedded with reddish brown mudstone, shale, and siltstone. Clasts in the conglomerates are predominantly rounded to subrounded cobbles and pebbles of vein quartz and quartzite with maximum dimensions of 8 inches (20 cm) embedded in a reddish calcareous, mudstone matrix. The conglomerate beds creat loose and friable that weather free on the surface. Thickness of the member ranges from 0 to approximately 100 feet (30 meters) with an average of about 25 feet (8 meters). | 04-01-02 | DMU Unit 2 | ^ni | 705 | 102,153,255 | None | MGS_LITTL2025.1 | Conglomerate | High | DMU006
8 | CZscb | Sams Creek Formation metabasalt | Sams Creek Formation metabasalt | Late Proterozoic to early Cambrian | Olive green to dark greenish gray, foliated to flow banded, vesicular metabasalt. Basalt intervals appear to be interlayered with greenish gray to silvery gray, tuffaceous phyllite. Some beds are sheared and contain dark purple to black brecciated phyllite containing elongated clasts. | 05-01 | DMU Unit 1 | _Zscb | 344 | 204,179,179 | None | MGS_LITTL2025.1 | Mafic-composition lava flows | Medium | DMU007
9 | None | Ijamsville Formation | Ijamsville Formation | Late Proterozoic to early Cambrian | Gray, bluish gray, silvery gray, and greenish gray phyllite and limestone containing thin beds of tuffaceous sandstone. Individual mapped units contain varying combinations and percentages of each type of phyllite so that the named lithology is borne by the dominant phyllite. | 06-01 | DMU-Heading1 | None | None | None | None | MGS_LITTL2025.1 | Lower-grade metamorphic rock, of unspecified origin | Medium | DMU008
10 | CZisp | slaty phyllite | slaty phyllite subunit of the Ijamsville Formation | Late Proterozoic to early Cambrian | Dark gray, grayish purple, and dark bluish gray phyllite with local light gray streaks and layers of greenish gray tuffaceous phyllite. Unit parts in regular, millimeter-thick layers reminiscent of slaty cleavage. Contains common intervals of bluish gray, thin- to medium-bedded, locally laminated, argillaceous, ribbony Silver Run Limestone (CZisr). Stratification in limestone strata is up to 10 cm (4 inches) thick and highly contorted. This phyllite unit is partially equivalent to the Silver Run Limestone (srl) of Fisher (1978) and Sams Creek Silver Run Limestone (CZscsr) of Reger et al. (2004) in the New Windsor quadrangle, and the Silver Run Limestone of the Marburg Formation (mfs) of Edwards (1986) and Silver Run Limestone of the Sams Creek Formation (CZscsr) of Reger and Edwards (2006). Owing to deformation and inconsistent bedding indicators thickness is undeterminable. | 06-01-01 | DMU Unit 2 | _Zisp | 221 | 222,235,222 | None | MGS_LITTL2025.1|USGS_NEWWI1978|MGS_NEWWI2004.1|MGS_UNION1986|MGS_UNION2006.1 | Slate and phyllite, of sedimentary-rock origin | High | DMU009
11 | CZisr | Silver Run Limestone | Silver Run Limestone subunit of the slaty phyllite subunit of the Ijamsville Formation | Late Proterozoic to early Cambrian | Common intervals of bluish gray, thin- to medium-bedded, locally laminated, argillaceous, ribbony Silver Run Limestone (CZisr) within the slaty phyllite subunit of the Ijamsville formation. Stratification in limestone strata is up to 10 cm (4 inches) thick and highly contorted. | 06-01-01-01 | DMU Unit 3 | _Zisr | 434 | 179,179,204 | None | MGS_LITTL2025.1 | Meta-carbonate rock | High | DMU010
12 | CZimp | muscovite-chlorite-phyllite | muscovite-chlorite-phyllite subunit of the Ijamsville Formation | Late Proterozoic to early Cambrian | Light greenish gray to grayish green, and tan to silvery phyllite. The micas and chlorite are typically segregated into prominent pinstripe laminations spaced 1 to 3 cm (0.4 to 1.2 inches) apart and parallel to cleavage. Resistant to weathering; crops out extensively and commonly forms low ridges capped by a thin sandy soil. Locally, light gray, discontinuous, tuffaceous sandstone can be mapped (CZiq). Corresponds to the Ijamsville mica-chlorite-quartz phyllite (ijqp) of Fisher (1978) that crops out west of the Avondale Fault and to the Gillis Formation (gf) of Edwards (1986). | 06-01-02 | DMU Unit 2 | _Zimp | 201 | 222,235,255 | None | MGS_LITTL2025.1|USGS_NEWWI1978|MGS_UNION1986 | Lower-grade metamorphic rock, of unspecified origin | Medium | DMU011
14 | CZiq | discontinuous tuffaceous sandstone | tuffaceous sandstone subunit of the muscovite-chlorite-phyllite and the chlorite phyllite subunits of the Ijamsville Formation | Late Proterozoic to early Cambrian | Locally, light gray to greenish gray, discontinuous, tuffaceous phyllitic sandstone. Can be found within both the muscovite-chlorite-phyllite (CZimp) subunit and the chlorite-phyllite (CZicp) subunit of the Ijamsville Formation. | 06-01-02-01 | DMU Unit 3 | _Ziq | 75 | 255,153,102 | None | MGS_LITTL2025.1 | Quartzite | Medium | DMU013
13 | CZicp | chlorite-phyllite | chlorite phyllite subunit of the Ijamsville Formation | Late Proterozoic to early Cambrian | Pale green to greenish gray phyllite. Contains subordinate amounts of paragonite and muscovite phyllite. Chloritic laminae commonly alternate with white mica-albite-quartz layers up to 5 mm (0.2 inch) thick; most of these layers parallel axial-plain cleavage and must be tectonic in origin, but some may be relict bedding laminations (Fisher, 1978). Locally, light gray, discontinuous, tuffaceous sandstone can be mapped (CZiq). Corresponds in part to the Sams Creek chlorite phyllite (sccp) of Fisher (1978) and the tuffaceous phyllite [also CZitp] of the Union Bridge quadrangle. | 06-01-03 | DMU Unit 2 | _Zicp | 311 | 204,235,235 | None | MGS_LITTL2025.1|USGS_NEWWI1978|MGS_UNION2006.1 | Lower-grade metamorphic rock, of unspecified origin | Medium | DMU012
15 | CZitp | tuffaceous phyllite | tuffaceous phyllite subunit of the Ijamsville Formation | Late Proterozoic to early Cambrian | Dark gray, grayish red, reddish purple, and bluish gray, silty, granular tuffaceous phyllite with light gray lapilli streaks and blebs. Intermixed with intervals of greenish gray to gray, tan-weathering, tuffaceous phyllite and silty tuffaceous phyllite. Contains intermixed variegated and lustrous to dull, purple to reddish gray hematitic muscovite phyllite and tan to green chlorite muscovite phyllite. Corresponds to parts of the Urbana Formation of Edwards (1986), tuffaceous phyllite of Brezinski et al. (2004), and Ijamsville Phyllite of Reger and Edwards (2006). Owing to deformation and inconsistent bedding indicators thickness cannot be determined. | 06-01-04 | DMU Unit 2 | _Zitp | 403 | 179,204,255 | None | MGS_LITTL2025.1|MGS_UNION1986|MGS_UNION2006.1|MGS_WALKE2004.1 | Intermediate-composition pyroclastic flows | Medium | DMU014
16 | CZu | Urbana Formation | Urbana Formation | Late Proterozoic to early Cambrian | Dull, olive gray to light olive gray, silty, sandy, phyllite, metasiltstone, and argillaceous sandstone. Stratification obscured by deformational fabrics, but often preserve primary textures including grading, cross-bedding, ripple marked, and bioturbation. Discontinuous fine- to medium-grained, light olive gray and light brownish gray metasandstone (CZus) are friable, lenticular, and intensely cleaved. Interpreted to be partially equivalent to the Harpers Formation of Jonas (1928). Thickness is indeterminable. | 07-01 | DMU Unit 1 | _Zu | 24 | 255,191,191 | None | MGS_LITTL2025.1|MGS_CLGEO1928 | Lower-grade metamorphic rock, of unspecified origin | Medium | DMU015
17 | CZus | metasandstone | metasandstone subunit of the Urbana Formation | Late Proterozoic to early Cambrian | Discontinuous fine- to medium-grained, light olive gray and light brownish gray metasandstone. Can be found within the Urbana Formation (CZu). | 07-01-01-01 | DMU Unit 3 | _Zus | 35 | 255,166,166 | None | MGS_LITTL2025.1 | Quartzite | Medium | DMU016
18 | CZmb | Marburg Formation | Marburg Formation | Late Proterozoic to early Cambrian | Predominately greenish gray, pale olive gray, silvery gray, silty, sandy phyllite. Some intervals are dark gray, to dark greenish gray, exhibiting pinstriped foliation where phyllite layers are folded with light gray, quartz-rich layers. Minute (>0.01mm) disseminated flakes of hematite and pyrite are abundant. Formation contains localized layers of quartzose metasandstone to metagraywacke (CZmbs) vary from light to medium olive-gray, are medium- to coarse-grained, and can be foliated, blocky, or massive. Massive intervals of metasandstone can be up to 3 feet thick and comprised of subrounded quartz grains surrounded in a quartz and mica matrix. This interval is equivalent to the Urbana Formation of Edwards and Glaser (1993), and the Harpers Formation of Jonas (1928). | 08-01 | DMU Unit 1 | _Zmb | 244 | 222,179,179 | None | MGS_LITTL2025.1|MGS_LITTL1993|MGS_CLGEO1928 | Lower-grade metamorphic rock, of unspecified origin | Medium | DMU017
19 | CZmbs | quartzose metagreywacke/metasandstone | quartzose metagreywacke/metasandstone subunit of the Marburg Formation | Late Proterozoic to early Cambrian | Localized layers of quartzose metasandstone to metagraywacke (CZmbs) vary from light to medium olive-gray, are medium- to coarse-grained, and can be foliated, blocky, or massive. Massive intervals of metasandstone can be up to 3 feet thick and comprised of subrounded quartz grains surrounded in a quartz and mica matrix. Can be found within the Marburg Formation (CZmb). | 08-01-01-01 | DMU Unit 3 | _Zmbs | 404 | 179,179,255 | None | MGS_LITTL2025.1 | Quartzite | Medium | DMU018

#### Glossary

OBJECTID | Term | Definition | DefinitionSourceID | Glossary_ID
--- | --- | --- | --- | ---
21 | bedding | Formed, arranged, or deposited in layers or beds, or made up of or occurring in the form of beds; esp. said of a layered sedimentary rock, deposit, or formation. The term has also been applied to nonsedimentary material that exhibits depositional layering, such as the "bedded deposits" of volcanic tuff alternating with lava in the mantle of a stratovolcano. | AGI_2011 | GLO016
1 | certain | Identity of a feature can be determined using relevant observations and scientific judgment; therefore, one can be reasonably confident in the credibility of this interpretation. | FGDC-STD-013-2006 | GLO001
23 | cleavage | A locally planar fabric in an unmetamorphosed or weakly metamorphosed, fine-grained rock defined by either the tendency of a rock to split in a particular direction, a preferred orientation of crystal planes in mineral grains, or a preferred orientation of inequant grain shapes; it is a product of deformation or metamorphism. | AGI_2011 | GLO018
18 | contact | A plane or irregular surface between two different types or ages of rock, sediment or other geologic and stratigraphic units. | AGI_2011 | GLO013
17 | cross section line | A plane or polyline along which a diagram is drawn showing the transected subsurface and topographic features and geology; specifically a vertical section drawn at right angles to the longer axis of a geologic feature. | AGI_2011 | GLO012
11 | DMU-Heading1 | Header, bolded text, no indent, 11pt Times New Roman font. This format is used for groups or headings of formations (with members or subunits) where no group is present. | MGS_LITTL2025.1 | GLO006
12 | DMU Unit 1 | Formation style, bolded title, 11pt Times New Roman font. This format is used for largest unit descriptions, usually formations; mapped at the surface, and may or may not contain subunits. | MGS_LITTL2025.1 | GLO007
13 | DMU Unit 2 | Member, or major lithology style, bolded title, 11 pt Times New Roman font. This format is used for member, or other major lithologies found within a Formation unit. | MGS_LITTL2025.1 | GLO008
14 | DMU Unit 3 | Minor lithology style, bolded title, 11 pt Times New Roman font. Generally used for subunits or beds within a formation or member. Text description within higher-order units. | MGS_LITTL2025.1 | GLO009
19 | fault | A discrete surface or zone of discrete surfaces separating two rock masses across which one mass has slid past the other. | AGI_2011 | GLO014
20 | fold | A curve or bend of a planar structure such as rock strata, bedding planes, foliation, or cleavage. A fold is usually a product of deformation, although its definition is descriptive and not genetic and may include primary structures. | AGI_2011 | GLO015
22 | foliation | A general term for a planar arrangement of textural or structural geatures in any type of rock, esp. the locally planar fabric in a rock defined by a fissility, a preferred orientation of crystal planes in mineral grains, a preferred orientation of inequant grain shapes, or from compositional banding. In igneous rocks, planar parallelism of flaky or tabular minerals and mineral aggregates, slabby xenoliths, or flattened vesicles as well as compositional layering. In metamorphic rocks, planar parallelism of flaky minerals and compositional layering. | AGI_2011 | GLO017
9 | High | The selected term in the GeoMaterial field (and its definition) adequately characterizes the overall lithologic nature of rocks and (or) sediments in the map unit. | GeMS_2020 | GLO004
8 | inferred | The identity or the existence of a feature can be determined using relevant observations and scientific judgment, however its spatial location is not observable in the field. | MGS_LITTL2025.1 | GLO003
10 | Medium | The selected term in the GeoMaterial field (and its definition) generally characterizes the overall lithologic nature of rocks and (or) sediments in the map unit, but one or more significant but minor lithologies are not adequately described by the selected term. | GeMS_2020 | GLO005
16 | neatline | Quadrangle outline or mapped area boundary. | MGS_LITTL2025.1 | GLO011
7 | questionable | Identity of a feature cannot be determined using relevant observations and scientific judgment; therefore, one cannot be reasonably confident in the credibility of this interpretation. For example, IdentityConfidence = questionable is appropriate when a geologist reasons "I can see some kind of planar feature that separates map units in this outcrop, but I cannot be certain if it is a contact or a fault." | FGDC-STD-013-2006 | GLO002
24 | recreational GPS | Data collected with a mobile device using GIS software such as ESRI Field Maps or IGIS. | MGS_LITTL2025.1 | GLO019
15 | state boundary | The boundary between states as determined by the Maryland Physical Boundaries - County Boundaries (Detailed) feature hosted on MD iMap, reprojected into NAD 1983 (2011) StatePlane Maryland FIPS 1900 (US Feet) [WKID 6488]. | MGS_LITTL2025.1 | GLO010

### Database Inventory

This summary of database content is provided as a convenience to GIS analysts, reviewers, and others. It is not part of the GeMS compliance criteria.
DataSources, nonspatial table, 16 rows
DescriptionOfMapUnits, nonspatial table, 18 rows
GeoMaterialDict, nonspatial table, 101 rows
Glossary, nonspatial table, 19 rows
GeologicMap, feature dataset
MapUnitOverlayPolys, simple polygon feature class, 18 rows
ContactsAndFaults, simple polyline feature class, 369 rows
GeologicLines, simple polyline feature class, 29 rows
CartographicLines, simple polyline feature class, 1 rows
MapUnitLines, simple polyline feature class, 50 rows
OrientationPoints, simple point feature class, 135 rows
MapUnitPolys, simple polygon feature class, 76 rows
Stations, simple point feature class, 302 rows