Landover Road and 95 Junction: Early/Lower Maastrichtian, Maryland
collected by E. Hartstein & L. Decina

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Lithophaga carolinensis Conrad 1875
Acirsa flexicostata Sohl 1964
Reptilia - Plesiosauria - Elasmosauridae
cf. Cimoliasaurus sp. Leidy 1851
Gallagher 1993 1 specimen
NJSM 12505 (cast of specimen in private coll. of L. Decina)
Actinopteri - Aulopiformes - Enchodontidae
Enchodus feroz
Actinopteri - Tetraodontiformes - Eotrigonodontidae
Stephanodus sp. Zittel 1883
Actinopteri - Pycnodontiformes - Pycnodontidae
Anomoeodus phaseolus (Hay 1899)
Chondrichthyes - Myliobatiformes - Myliobatidae
Myliobatis sp. Cuvier 1816
Chondrichthyes - Rajiformes - Sclerorhynchidae
Ischyrhiza mira Leidy 1856
Chondrichthyes - Orectolobiformes - Ginglymostomatidae
Nebrius sp. Rüppell 1837
Chondrichthyes - Lamniformes - Odontaspididae
Hypotodus sp. Jaekel 1895
Chondrichthyes - Lamniformes - Otodontidae
Cretolamna appendiculata (Agassiz 1835)
recombined as Cretalamna appendiculata
Chondrichthyes - Lamniformes - Serratolamnidae
Cretolamna cf. serrata (Agassiz 1838)
recombined as Serratolamna serrata
Chondrichthyes - Squatinidae
Squatina hassei Leriche 1929
Polychaeta - Serpulimorpha
Hamulus falcatus
Longitubus lineatus
Cephalopoda - Ammonitida - Baculitidae
Baculites sp. Lamarck 1799
Cephalopoda - Ammonitida - Scaphitidae
Discoscaphites abyssinius
Discoscaphites conradi (Morton 1834)
Cephalopoda - Ammonitida - Sphenodiscidae
Sphenodiscus lenticularis (Owen 1852)
replaced by Sphenodiscus lobatus
Cephalopoda - Nautilida - Nautilidae
Eutrephoceras dekayi (Morton 1834)
Gastropoda - Heterostropha - Ringiculidae
Ringicula pulchella Shumard 1861
recombined as Ringicula (Ringicula) pulchella
Gastropoda - Euomphalina - Euomphalidae
Weeksia peplanata
Gastropoda - Vasidae
Lupira sp. Stephenson 1941
Gastropoda - Opisthobranchia - Scaphandridae
Ellipsoscapha mortoni Forbes 1845
Gastropoda - Turritellidae
Turritella bilira Stephenson 1941
recombined as Haustator bilira
Gastropoda - Naticidae
Gyrodes subcarinatus
Gyrodes spillmani Gabb 1861
recombined as Gyrodes (Sohlella) spillmani
Gyrodes supraplicatus Conrad 1858
Euspira reetilabrum
Gastropoda - Neogastropoda - Fasciolariidae
Remera flexicostata Sohl 1964
Gastropoda - Neogastropoda - Melongenidae
Deussenia ripleyana Harbison 1945
Gastropoda - Neogastropoda - Turridae
Beretra speciosa Sohl 1964
Fusimilis kummeli Sohl 1964
Gastropoda - Neogastropoda - Turbinellidae
Napulus sp. Stephenson 1941
Gastropoda - Neogastropoda - Volutidae
Liopeplum cretaceum Conrad 1858
Liopeplum coronatum Sohl 1964
Liopeplum canalis Conrad 1858
Gastropoda - Xenophoridae
Xenophora leprosa (Morton 1834)
recombined as Xenophora (Endoptygma) leprosa
Bivalvia - Nuculanida - Nuculanidae
Nuculana rostratruncata (Gardner 1916)
Bivalvia - Nuculida - Nuculidae
Nucula slackiana
Bivalvia - Mytilida - Mytilidae
Cuneolus pectrosa
Cuneolus tippana (Conrad 1858)
Bivalvia - Pectinida - Anomiidae
Anomia ornata Gabb 1876
Anomia argentaria Morton 1833
Bivalvia - Ostreida - Flemingostreidae
Agerostrea mesenterica (Morton 1834)
recombined as Lopha mesenterica
Bivalvia - Ostreida - Gryphaeidae
Exogyra costata (Say 1820)
original and current combination Exogyra (Exogyra) costata
Bivalvia - Cardiida - Cardiidae
Granocardium eufalense
synonym of Trachycardium
Bivalvia - Cardiida - Veneridae
Legumen planulatum
Bivalvia - Cardiida - Mactridae
Cymbophora appressa
Cymbophora berryi Gardner 1916
Bivalvia - Cardiida - Arcticidae
Veniella conradi Morton 1833
Bivalvia - Pholadida - Pholadidae
Clavipholas pectrosa
Xylophagella irregularis
Goniochasma sp. Meek 1864
Bivalvia - Solenida - Pharidae
Leptosolen biplicata (Conrad 1858)
Bivalvia - Hiatellida - Hiatellidae
Glycimeris mortoni
original and current combination Glycymeris
Panope decisa
corrected as Panopea
Bivalvia - Poromyida - Poromyidae
Liopistha prolexta
Bivalvia - Carditida - Crassatellidae
Crassatella vadosa Morton 1834
Crassatella pteropsis Conrad 1860
recombined as Bathytormus pteropsis
Bivalvia - Trigoniida - Megatrigoniidae
Trigonia eufaulensis Gabb 1860
recombined as Pterotrigonia (Scabrotrigonia) eufaulensis
Malacostraca - Decapoda - Callianassidae
Protocallianassa mortoni (Rathbun 1935)
original and current combination Callianassa mortoni
Anthozoa - Scleractinia - Micrabaciidae
Micrabacia marylandica Stephenson 1916
see common names

Geography
Country:United States State/province:Maryland County:Prince Georges
Coordinates: 38.9° North, 76.9° West (view map)
Paleocoordinates:39.7° North, 52.8° West
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Maastrichtian 10 m.y. bin:Cretaceous 8
Key time interval:Early/Lower Maastrichtian
Age range of interval:72.10000 - 66.00000 m.y. ago
Stratigraphy
Formation:Severn
Stratigraphic resolution:group of beds
Lithology and environment
Primary lithology: lithified silty,sandy lignite
Includes fossils?Y
Environment:marginal marine indet.
Taphonomy
Modes of preservation:mold/impression,concretion,permineralized
Size of fossils:macrofossils,mesofossils,microfossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:general faunal/floral analysis
Collectors:E. Hartstein & L. Decina
Metadata
Database number:125950
Authorizer:M. Uhen, M. Carrano Enterer:M. Shalap, M. Carrano
Modifier:J. Fearon
Created:2012-03-27 08:41:37 Last modified:2024-02-20 20:49:30
Access level:the public Released:2012-03-27 08:41:37
Creative Commons license:CC BY
Reference information

Primary reference:
40895. E. F. Hartstein and L. E. Decina. 1986. A new Severn formation (Early Middle Maastrichtian, Late Cretaceous) locality in Prince Georges County, Maryland. The Mosasaur 3:87-95 [M. Uhen/M. Shalap]

Secondary references:

54671 W. B. Gallagher. 1993. The Cretaceous/Tertiary mass extinction event in the North Atlantic coastal plain. The Mosasaur 5:75-154 [M. Carrano/M. Carrano]