Florissant locality 2, U of California Loc. 3731 CENSUS (Eocene to of the United States)

Also known as University of California Locality 3731

Where: Colorado (38.9° N, 105.3° W: paleocoordinates 40.1° N, 97.8° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Florissant Formation, Late/Upper Eocene to Late/Upper Eocene (37.2 - 28.4 Ma)

• From MacGinitie: Fossils are found in unit 3, about 50 feet of lake shales and associated volcanic sediments. The best and most abundant plant and insect fossils are found in this member, in paper shales at or near its base.

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine; fine-grained, gypsiferous, tuffaceous shale and siltstone

• Lake was situated close to volcanic source; a probable source is the Guffey volcano, 15 miles southwest of Florissant.
• From MacGinitie: Frequent alternations of fine-grained paper shales and bedded tuffs showing a considerable variety of color, texture, and thickness of strata. The best and most abundant plant and insect fossils are found in paper shales. From Manchester: fossils are preserved in laminated tuffaceous sediments...sediment ranges from siltstone to conglomeratic, but best preserved leaf and fuit remains have been found in the siltstone layers.

Size class: macrofossils

Preservation: mold/impression, original carbon

Reposited in the UCMP

Collection methods: bulk,

• Out of the 588 specimens listed, 9 are described as 'uncertain affinity'. They are not reported in the occurrence list.

Primary reference: H. D. MacGinitie. 1953. Fossil Plants of the Florissant Beds of Colorado. Carnegie Inst. of Washington, Contributions to Paleontology Publ. 599:1-198 [C. Labandeira/C. Labandeira/M. Kosnik]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 39839: authorized by Peter Wilf, entered by Jocelyn Sessa on 08.06.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

 Lychniscosa - Camerospongiidae
Robinia lesquereuxi glass sponge
 Pinales - Pinaceae
Pinus sp. Linnaeus 1753 pine
Pinus seed
 Pinales - Taxodiaceae
Sequoia affinis coast redwood
Sequoia sp. Endlicher 1847 coast redwood
Sequoia cone
 Typhales - Commelinidae
Typha lesquereuxi Cockerell 1908
 Polypodiales - Dryopteridaceae
 Rhamnales - Rosidae
 Urticales - Dilleniidae
 Juglandales - Hamamelidae
 Magnoliales - Lauraceae
 Fabales - Leguminosae
 Fabales - Fabaceae
? Fabaceae indet. Lindley 1836
Legume ? seed
 Myrtales - Myrtaceae
 Rosales - Rosaceae
Cercocarpus sp. Humboldt et al. 1823
Cercocarpus fruit
 Sapindales - Anacardiaceae
 Sapindales - Sapindaceae
Koelreuteria alleni golden rain tree
 Sapindales - Aceraceae
 Sapindales - Meliaceae
Cedrela sp. Browne 1756
Cedrela seed
 Sapindales - Burseraceae
 Proteales - Proteaceae
Lomatia sp. Brown 1810
Lomatia seed
 Fagales - Fagaceae
 Ranunculales - Berberidaceae
 Violales - Salicaceae
Fagopsis longifolia Hollick 1909