Maryland Department of Natural Resources

Devonian-Silurian Fossils

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Eatonia singularis Eatonia peculiaris Eatonia sinuata Eatonia sinuata Spirifer macropleura Rhipidomella assimilis Spirifer murchisoni Phacops rana Grammysia arcuata Spirorbis gyrus Bellerophon (Bucanopsis) leda Pterinea nodocosta Orthoceras constrictum Spirifer mesastrialis Spirifer disjunctus Palaeaster clarki Turbo coronula Buchiola retrostriata Whitfieldella intermedia Arthrophycus harlani Tentaculites niagarensis Sphaerocystites multifasciatus Palaeaspis americana Spirifer octocostatus
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Devonian

Fig. 1 Eatonia singularis (Vanuxem)
Fig. 2 Eatonia singularis (Vanuxem)
Fig. 3 Eatonia peculiaris (Conrad)
Fig. 4 Eatonia sinuata Hall
Fig. 5 Eatonia sinuata Hall
Fig. 6 Spirifer macropleura (Conrad)
Fig. 7 Rhipidomella assimilis (Hall)
Fig. 8 Spirifer murchisoni Castelnau
Fig. 9 Phacops rana (Green)
Fig. 10 Grammysia arcuata (Conrad)
Fig. 11 Spirorbis gyrus Clarke
Fig. 12 Belleroph (Bucanopsis) leda Hall
Fig. 13 Pterinea nodocosta Clarke
Fig. 14 Orthoceras constrictum Vanuxem
Fig. 15 Spirifer mesastrialis Hall
Fig. 16 Spirifer disjunctus Sowerby
Fig. 17 Palaeaster clarki Clarke
Fig. 18 Turbo coronula Clarke
Fig. 19 Buchiola retrostriata v. Buch

Silurian

Figs. 20-23 Whitfieldella intermedia Hall
Fig. 24 Arthrophycus harlani Conrad (greatly reduced)
Figs. 25-27 Spirifer octocostatus Hall
Fig. 28 Dinorthis pectinella (Emmons) Hall & Clarke
Fig. 29 Tentaculites niagarensis var cumberlandiae Hall
Figs. 30-31 Sphaerocystites multifasciatus Hall
Fig. 32 Palaeaspis americana Claypole (Restored)
Reference: Clark, W.B., et al., 1906, Volume VI, Maryland Geological Survey, Baltimore, MD