Well 27b Broward County (Pleistocene of the United States)

Where: Broward County, Florida (26.3° N, 80.9° W: paleocoordinates 26.4° N, 80.5° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Caloosahatchee Formation, Early/Lower Pleistocene (2.6 - 0.8 Ma)

• Determined from cores from test wells drilled by US Corps of Engineers in 1950

•0.1 ft above sea level

•Age determination revised in more recent papers (see Lithostratigraphy, Petrography,

•Biostratigraphy, and Strontium-Isotope

•Stratigraphy of the Surficial Aquifer System

•of Western Collier County, Florida, Edwards et al., 1998, USGS Open-File Report 98-205)

• formation-level stratigraphic resolution

Environment/lithology: marine; gray, white, silty, sandy marl

• The Caloosahatchee marl consists predominantly of shells, sand, and silt. Fresh unweathered exposures are generally pale cream-colored to light gray, although green clay marls have been included in the formation. The sand and shell variations of the Caloosahatchee marl can be separated from the marine formations of Pleistocene age only by identification of the mollusk faunas.

Size class: mesofossils

Collection methods: core

• observed from cores

Primary reference: M. C. Schroeder and H. Klein. 1954. Geology of the Western Everglades Area, Southern Florida. United States Geological Survey Circular 314 [A. Miller/K. Bulinski/P. Wagner]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 75007: authorized by Arnold Miller, entered by Kate Bulinski on 13.09.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

 Cardiida - Veneridae
Chione sp. von Mühlfield 1811 venus clam
 Neogastropoda - Olividae
Oliva sp. Bruguière 1789 olive snail
thick parietal callus
 Sorbeoconcha - Cerithiidae
 Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758 tusk shell