Chancellor Point [St. Marys Fm] (Miocene of the United States)

Where: St Mary's County, Maryland (38.2° N, 76.4° W: paleocoordinates 38.3° N, 74.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: St Marys Formation, Late/Upper Miocene (11.6 - 5.3 Ma)

• LITHOSTRATIGRAPHY: From the St Marys Fm, for which lithostratigraphic relations are not discussed. AGE: Late Miocene; not discussed in text; "Shattuck Zone 24". STRATIGRAPHIC POSITION: From unknown position within formation.

• bed-level stratigraphic resolution

Environment/lithology: coastal; unlithified, silty sandstone

• LITHOLOGY: Silty sand. LITHIFICATION: Unlithified, based on figured specimens.

Size class: macrofossils

Preservation: original aragonite

Collected by Petuch in 1980-1982; reposited in the USNM

• COLLECTOR: E. J. Petucj, 1980-1982. REPOSITORY: ANSP and USNM.

Primary reference: E. J. Petuch. 1988. Neogene History of Tropical American Mollusks 1-217 [A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 92325: authorized by Austin Hendy, entered by Austin Hendy on 08.11.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Limited to new and characteristic taxa described in text; not exhaustive. NOMENCLATURE: Authoritative publication, with species-resolution identifications.
Gastropoda
 Lepetellida - Fissurellidae
Fissurella fluviamariana n. sp. Petuch 1988 snail
 Cerithioidea - Turritellidae
Mariacolpus plebeia n. gen. Say 1824 turret shell
 Sorbeoconcha - Cassidae
"Mariacassis caelatum n. gen." = Echinophoria caelatura
"Mariacassis caelatum n. gen." = Echinophoria caelatura Conrad 1830 snail
 Neogastropoda - Conidae
Propebela parva Conrad 1830 cone shell
Propebela marylandica n. sp. Petuch 1988 cone shell
Conus (Leptoconus) sanctaemariae n. sp. Petuch 1988 cone shell
 Neogastropoda - Mangeliidae
Mariadrillia parvoidea n. gen. Martin 1904 snail
 Neogastropoda - Cochlespiridae
Chesasyrinx rotifera n. gen. Conrad 1830 snail
 Neogastropoda - Terebridae
Laevihastula marylandica n. gen. n. sp.
Laevihastula marylandica n. gen. n. sp. Petuch 1988 auger snail
 Neogastropoda - Drilliidae
Cymatosyrinx mariana n. sp. Petuch 1988 snail
Sediliopsis gracilis n. gen. Conrad 1830 snail
Chesaclava dissimilis n. gen. Conrad 1830 snail
Chesaclava quarlesi n. gen. n. sp. Petuch 1988 snail
 Neogastropoda - Cancellariidae
Marianarona marylandica n. gen. n. sp., Marianarona asheri n. gen. n. sp., Mariasveltia lunata n. gen.
Marianarona marylandica n. gen. n. sp. Petuch 1988 snail
Marianarona asheri n. gen. n. sp. Petuch 1988 snail
Mariasveltia lunata n. gen. Conrad 1830 snail
 Neogastropoda - Melongenidae
Turrifulgur turriculus n. gen. n. sp. whelk
Busycotypus asheri n. sp. Petuch 1988 whelk
Busycotypus rugosum Conrad 1843 whelk
Busycotypus coronatum Conrad 1840 whelk
Busycotypus alveatum Conrad 1863 whelk
"Turrifulgur fusiforme n. gen." = Busycon fusiformis Conrad 1840 whelk
 Neogastropoda - Fasciolariidae
Mariafusus marylandica n. gen. Martin 1904 snail
Pseudoaptyxis sanctaemariae n. sp. Petuch 1988 snail
 Neogastropoda - Buccinidae
Ptychosalpinx altilis Conrad 1832 true whelk
Ptychosalpinx pustulosus n. sp. Petuch 1988 true whelk
 Neogastropoda - Costellariidae
Mariaturricula biscatenaria n. gen. Conrad 1834 ribbed mitre
Nodisurculina engonata n. gen. Conrad 1862 ribbed mitre
 Neogastropoda - Volutidae
Volutifusus mutabilis Conrad 1834 volute
Volutifusus asheri n. sp. Petuch 1988 volute
Volutifusus meganucleus n. sp. Petuch 1988 volute
Volutifusus marylandicus n. sp. Petuch 1988 volute
Volutifusus acus n. sp. Petuch 1988 volute
"Scaphellopsis solitaria n. gen." = Scaphella solitaria Conrad 1830 volute
 Neogastropoda - Muricidae
Mariasalpinx emilyae n. gen. n. sp. Petuch 1988 murex snail
Boreotrophon harasewychi n. sp. Petuch 1988 murex snail
Chesatrophon chesapeakeanus n. gen. n. sp. Martin 1904 murex snail
 Sorbeoconcha - Naticidae
Poliniciella marylandica n. gen. n. sp. Petuch 1988 moon snail
Neverita (Glossaulax) asheri n. sp. Petuch 1988 moon snail
Neverita (Glossaulax) discula n. sp. Petuch 1988 moon snail
Euspira tuomeyi moon snail
 Epitonioidea - Epitoniidae
Epitonium chancellorensis n. sp. Petuch 1988 wentletrap