Where: Virginia (37.4° N, 77.4° W: paleocoordinates 31.6° N, 31.1° W)
• coordinate stated in text
• outcrop-level geographic resolution
When: Patuxent Formation (Potomac Group), Aptian (125.0 - 113.0 Ma)
• Brenner's pollen Zone I
Environment/lithology: fluvial-deltaic; unlithified sandstone and unlithified claystone
Size classes: macrofossils, mesofossils, microfossils
Reposited in the FMNH
Collection methods: bulk, chemical, peel or thin section, sieve,
• "Fossils were extracted from the sediments by sieving in water. After sieving the plant material was rinsed in HF, HCl, and water and air dried... Material for ultrastructural and anatomical studies was dehydrated in an ethanol-propylene oxide series, embedded in Epon and sectioned on an LKB Ultratome III ultramicrotome with a glass knife (sections 3 micrometers thick) or diamond knife (sections about 600 angstroms thick)." (Pedersen et al. 1993)
Primary reference: K. R. Pedersen, E. M. Friis, and P. R. Crane. 1993. Pollen organs and seeds with Decussosporites Brenner from Lower Cretaceous Potomac Group sediments of eastern USA. Grana 32:273-289 [H. Sims/J. Cassara/J. Cassara]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 36515: authorized by Hallie Sims, entered by Jason Cassara on 01.02.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Brenneria potomacensis, Brennerispermum potomacensis n. gen. n. sp.
Brennerispermum potomacensis n. gen. n. sp. | |
Pinopsida | |
Taxodiaceae indet. Saporta 1865 | |
Podozamites sp. Braun 1843 podocarp | |
Decussosporites | |
Exesipollenites | |
Exesipollenites sp. Balme 1957 a possible conifer or bennettitalean grain of uncertain affinity...comprising more than 15% of the palynoflora
| |
Equisetopsida | |
Pseudofrenelopsis parceramosa, "Corollina (Classopollis) sp." = Classopollis
"Corollina (Classopollis) sp." = Classopollis Pflug 1953 cheirolepidiaceous pollen...typically constitutes more than 20% of the palynoflora
| |
Cycadopsida | |
|