USNM Locality No. 14252 (Cretaceous to of the United States)

Also known as Road Cut between Seminary Road and Richenbacher Ave. on Henry Shirley Memorial Highway, Alexandria City, Virginia (Potomac Group - Patuxent Fm.)

Where: Virginia (38.8° N, 77.1° W: paleocoordinates 33.0° N, 30.0° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Patuxent Formation (Potomac Group), Barremian to Barremian (129.4 - 113.0 Ma)

• Lower Zone I of Hickey and Doyle (1977)

Environment/lithology:

• Stratum 2 to 2.5 feet (60-76 cm) thick and undetermined areal extent, comprising lignitized logs and other plant debris enclosed in a medium gray clay, with irregularly distributed pockets of silt and medium to coarse sand grains.

Size class: microfossils

Preservation: original sporopollenin

Reposited in the USNM

Collection methods: surface (in situ), chemical, sieve,

Primary reference: F. M. Hueber. 1982. Megaspores and a Palynomorph from the Lower Potomac Group in Virginia. Smithsonian Contributions to Paleobiology (49)1-69 [R. Lupia/T. Naeher/T. Naeher]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 32477: authorized by Rick Lupia, entered by Tiffany Naeher on 03.07.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Thylakosporites retiarius
Pteridopsida
 Marsileales -
Arcellites cf. pyriformis, Arcellites disciformis
Polypodiopsida
  - Marsileaceae
Crybelosporites sp., Crybelosporites striatus
Crybelosporites sp. Dettmann 1963
Crybelosporites striatus Dettmann 1963
Dictyothylakos pesslerae
  -
Dictyothylakos pesslerae
Dictyothylakos pesslerae Horst 1954
uncertain affinities
Erlansonisporites
  -
Erlansonisporites erlansonii
Echitriletes
  -
Echitriletes cf. lanatus
Verrutriletes
  -
Verrutriletes carbunculus
Paxillitriletes
  -
Paxillitriletes sp.
Paxillitriletes sp. Hall and Nicolson 1973