Maryland Department of Natural Resources

Cambro-Ordovician Fossils

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Isotelus maximus Trinucleus concentricus Dinorthis pectinella Dinorthis pectinella Rafinesquina alternata Diplograptus foliaceus Maclurea magna Plectambonites sericeus Hyolithes communis Hyolithes communis Hyolithes communis Obolella minor Hyolithes communis Obolella minor Micrometra bella Olenellus thompsoni Scolithus linearis
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Ordovician

Fig. 1 Isotelus maximus Locke (greatly reduced)
Fig. 2 Trinucleus concentricus Eaton
Fig. 3 Dinorthis pectinella (Emmons) Hall & Clarke
Fig. 4 Dinorthis pectinella (Emmons) Hall & Clarke
Fig. 5 Rafinesquina alternata (Emmons) Hall & Clarke.
Fig. 6 Diplograptus foliaceus (Murchison)
Fig. 7 Maclurea magna LeSueur
Fig. 8 Plectambonites sericeus (Sowerby) Hall & Clarke

Cambrian

Fig. 9 Hyolithes communis Billings
Fig. 10 Hyolithes communis Billings (transverse sections)
Fig. 11 Hyolithes communis Billings (transverse sections)
Fig. 12 Hyolithes communis Billings
Fig. 13 Obolella minor Walcott
Fig. 14 Obolella minor Walcott
Fig. 15 Micrometra bella (Billings) Walcott
Fig. 16 Olenellus thompsoni Hall
Fig. 17 Scolithus linearis Halde
Reference: Clark, W.B., et al., 1906, Volume VI, Maryland Geological Survey, Baltimore, MD