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Showing results for tags 'choptank'.
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Collected on the beach after a storm. This is an index fossil for the Drum Cliff member of the Choptank Formation, Shattuck Zone 18. Choptank is the dominant formation at Matoaka Beach. Donated to the Delaware Museum of Natural History.
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Collected from matrix washed into the Chesapeake Bay by landslide. Donated to the Delaware Museum of Natural History.
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This piece was excavated out of a block of matrix deposited in the Chesapeake Bay by a landslide. This specimen was donated to the Delaware Museum of Natural History.
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Collected from matrix in the Chesapeake Bay that was deposited by landslide. Donated to the Delaware Museum of Natural History.
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Collected from matrix deposited in the Chesapeake Bay by landslide. Donated to the Delaware Museum of Natural History.
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I never knew if the oyster shells on the beach were fossil or modern until I pulled this out of a block of matrix deposited by landslide into the Chesapeake Bay. This specimen was donated to the Delaware Museum of Natural History. Genus changed from Parahyotissa.
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Excavated from a block of submerged martrix deposited in the Chesapeake Bay by landslide. The common name, geoduck, is pronounced "gooey-duck." This specimen was donated to the Delaware Museum of Natural History.
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This is a particularly fragile type of shell, made of many fine layers, and is prone to disintegrate as these did. This rare steinkern was found on a block of matrix submerged in the Chesapeake Bay. Dimensions are for the best-exposed steinkern on the block. The entire block is 14 cm wide x 10 cm high x 5 cm deep.
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Found on the beach near Matoaka Cabins. This is the largest one I have found to date.
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This was excavated from a block of matrix collected from submerged landslide material in the Chesapeake Bay. The common name of the shell is pronounced "gooey-duck." The height listed is the diameter of the opening between valves on the posterior side, where the siphon extended.
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Chesapectin nefrens is an index fossil for the Drum Cliff Member of the Choptank Formation. This example is particularly nice because the interior is almost completely layered in pearl.
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- calvert cliffs
- chesapeake bay
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This piece was excavated out of a block of matrix deposited in the Chesapeake Bay by a landslide. The shell was partially exposed in the water. The dark side was still in the matrix while the light side was exposed to the water. The pock marks on the light side are from modern barnacles which I removed during preparation. L. heros is a species with variation in shape. It may have a taller or flatter spire and the overall shape may be more or less globular. This specimen was donated to the Delaware Museum of Natural History.
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Lunatia heros is a predatory snail that drilled holes in other mollusks' shells to eat the contents. One often finds hole that they left behind in the surrounding fossil shells. The shells of L. heros are variable, having more or less extended spirals, more or less globoular shape, etc. This specimen was donated to the Delaware Museum of Natural History.
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I erroneously identified this earlier as the similar Turritella plebia, until looking at one more reference! Mariacolpus octonaria is an index fossil for the Drum Cliff Member of the Choptank Formation. Donated to the Delaware Museum of Natural History
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Donated to the Delaware Museum of Natural History. According to L.W. Ward, 1998 ( Full Reference : L. W. Ward. 1998. Mollusks from the Lower Miocene Pollack Farm Site, Kenty County, Delaware: A preliminary analysis. Geology and paleontology of the lower Miocene Pollack Farm Fossil Site, Delaware [A. Miller/A. Hendy/A. Hendy] ) , the Genus was re-assigned from Fissuridae to Diodora.
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This specimen and dozens like it were collected from matrix material deposited in the waters of the Chesapeake Bay by a landslide. It is one of only a few species that consistently survived intact in the matrix samples I collected. Most specimens were single, unbroken valves, but several had both valves together and intact. A. tisphila is considered the most abundant find in the Choptank Formation. It is an index fossil for the Drum Cliff Member. This specimen was donated to the Delaware Museum of Natural History.
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A reasonably common find near Matoaka Beach Cabins. This was donated to the Delaware Museum of Natural History.
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Although I have collected this species from Choptank Formation matrix, this one was found on the beach. The red staining suggests it may have been from another formation as the Choptank sand at St Leonard is gray.
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Although there are oysters littering the beach, I would hesitate to call any one of them anything other than modern. The fossilized oysters of this type retained their colors remarkably well. This shell was excavated from a lump of matrix deposited in the Chesapeake Bay after a landslide. This specimen was donated to the Delaware Museum of Natural History.
