Coffin's Engine Bank, Swampoodle (Cretaceous of the United States)

Also known as Swamp Poodle, Coffin's Old Engine Bank, Singewald no. 243, Muirkirk

Where: Prince George's County, Maryland (39.0° N, 76.9° W: paleocoordinates 32.9° N, 31.3° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Arundel Clay Formation (Potomac Group), Late/Upper Aptian (122.5 - 112.0 Ma)

• Originall described as "Potomac Formation" and "Upper Jurassic."

•Palynology of the Potomac Group suggests a late Aptian age for the Arundel facies (Brenner, 1963; Doyle and Robbins, 1977; Hochuli et al., 2006; Doyle, 2012)

• group of beds-level stratigraphic resolution

Environment/lithology: mire or swamp; blue, carbonaceous claystone

• "variegated red and gray clays" in general, but Bibbins describes these beds as the "blue charcoal clay"

Size class: macrofossils

Collected by J. B. Hatcher, A. Bibbins in 1887-1888, 1891, 1894–1896; reposited in the USNM

Collection methods: quarrying, mechanical,

Primary reference: O. C. Marsh. 1888. Notice of a new genus of Sauropoda and other new dinosaurs from the Potomac Formation. American Journal of Science 35:89-94 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 28432: authorized by Matthew Carrano, entered by Matthew Carrano on 13.02.2003, edited by Roger Benson

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Testudinata -
Glyptops caelatus n. sp.2 Hay 1908 turtle
USNM 1930, 1939, 8512
 Crocodylia -
Crocodylia indet.3 Owen 1842 crocodilian
USNM 8511
 Loricata - Goniopholididae
Goniopholis affinis4 Lull 1911 crocodilian
USNM 8448–51, 8453
 Ornithischia -
Priconodon crassus n. gen. n. sp.
Priconodon crassus n. gen. n. sp. Marsh 1888 ankylosaur
USNM 2135, 8437–41; GC teeth
 Theropoda -
"Ornithomimus affinis n. sp." = Coelosaurus affinis1, ? Coelurus gracilis n. sp., Allosaurus medius n. sp.
"Ornithomimus affinis n. sp." = Coelosaurus affinis1 Gilmore 1920 ornithomimosaur
USNM 5453, 5652, 5684, 5703-04, 6107-08; GC 3121
? Coelurus gracilis n. sp. Marsh 1888 coelurosaur
USNM 4973, 8444-45; GC 3336, 3338
Allosaurus medius n. sp. Marsh 1888 tetanuran theropod
USNM 4972, 3446, 5693, 8447, 8502–8504
 Saurischia -
Pleurocoelus ? altus4 Marsh 1888 sauropod
USNM 5687, metatarsal
Pleurocoelus sp.3 Marsh 1888 sauropod
USNM PAL 357053, 357056, 357061, 357064, 357066, 357068, 357071-72, 357080, 357087
Pleurocoelus nanus n. gen. n. sp. Marsh 1888 sauropod
USNM 4968–70, 3372, 2263, 2267, 2667, 4968–70, 5372, 5452, 5639, 5650, 5656-57, 5660, 5667–69, 5673, 5677-78, 5691-92, 5700, 8442, 8457–70, 8472, 8494, 8510, PAL 357097