Fredericksburg (Cretaceous to of the United States)

Where: Fredericksburg city County, Virginia (38.3° N, 77.5° W: paleocoordinates 32.5° N, 30.4° W)

• coordinate based on political unit

• local area-level geographic resolution

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

• Oldest beds of the Potomac Group (Zone I - Doyle & Hickey, 1976)


Size classes: macrofossils, microfossils

Preservation: mold/impression, adpression, original carbon

Collection methods: chemical, mechanical,

Primary reference: J. E. Skog. 1988. Reassignment of Aspidium heterophyllum to a new genus in the family Matoniaceae. American Journal of Botany 75(8):1120-1129 [H. Wang/M. Arakaki/M. Arakaki]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 32091: authorized by Hongshan Wang, entered by Monica Arakaki on 04.06.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

 Gleicheniales - Matoniaceae
Delosorus heterophyllus Skog 1988
comb. nov.