Qal
Alluvium
Quaternary
Medium to dark grayish brown, locally reddish brown, poorly sorted, unconsolidated cobbles, pebbles, sand, silt.  Locally thicker layers of moderately sorted, rounded cobbles or pebbles reflecting previous locations of stream channel.  Thickness is typic
1-1
Header1
none
255,255,179
no pattern
DS01
Alluvial sediment
High
DMUID01
Qt
Terrace Deposits
Reddish brown, clayey to sandy matrix containing rounded pebbles to cobbles of sandstone, vein quartz, and quartzite.  These deposits are locally present along current stream levels of Toms Creek and the Monacacy River, but at a higher level than the pre
1-2
255,242,102
Sedimentary material
DMUID02
Trg
Gettysburg Formation
Triassic
Cyclically interbedded reddish gray, laminated, very fine-grained sandstone, sandy siltstone and red to reddish brown shale to rooted mudstone.  Sandstone and siltstone intervals are commonly laminated to cross-laminated and siltstone intervals are mudcr
4
^g
175,217,217
Sandstone and mudstone
DMUID06
Trn
New Oxford Formation
The New Oxford Formation consists of interbedded, gray, pinkish gray, and reddish brown, fine- to coarse-grained sandstone, brownish red to reddish gray siltstone, red mudstone, shale, and calcareous claystone.  Sandstone or sandstone-dominated intervals
5
^n
171,247,243
DMUID08
Trni
Irishtown Member
New Oxford Formation, Irishtown Member
Thin and discontinuous lenses and wedges of reddish brown, moderately well sorted, poorly cemented quartz-pebble conglomerate interbedded with red brown coarse-grained sandstone and red mudstone. Pebbles are equidimensional and typically moderate well to
5-2
Header2
^noi
100,152,254
Clastic sedimentary rock
DMUID09
Trns
Sandstone beds
New Oxford Formation, sandstone beds
5-1
^ns
120,201,168
Sandstone
DMUID18