Locality 203 - Chagres Sandstone (Miocene of Panama)

Also known as USGS #8436

Where: Panama (9.2° N, 80.1° W: paleocoordinates 9.1° N, 79.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Chagres Sandstone Formation, Messinian (7.2 - 5.3 Ma)

• Chagres Sandstone overlies and partly overlaps the Gatun Fm. Calcareous strata at the base of the formation throughout most of the outcrop area in the Canal Zone constitutes the Toro Limestone Mbr. The Chagres Sandstone is as much as 1000 ft thick. AGE: Late Miocene (late Tortonian-Messinian) according to Collins and Coates 1999); direct date is midpoint for established age range from microfossil biostratigraphy.

• bed-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified, fine-grained sandstone and poorly lithified siltstone

• No specific environmental data presented.
• Massive, generally fine-grained sandstone and some siltstone.

Size class: macrofossils

Reposited in the CAS, PRI, USNM

Collection methods: quarrying,

• Collected by A.A. Olsson and G.M. Bevier (1918). Material is also held (but not specified for any specific collection) at Stanford University, Acad. Nat. Sci. Phil., Cornell University, PRI, U. Cal. and Cal. Acad. Sci.

Primary reference: W. P. Woodring. 1957. Geology and Paleontology of Canal Zone and adjoining parts of Panama. United States Geological Survey Professional Paper 306(A) [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 60697: authorized by Austin Hendy, entered by Austin Hendy on 20.05.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for gastropoda and bivalvia.
 Nuculida - Nuculidae
Acila (Acila) isthmica Brown and Pilsbry 1911 divaricate nutclam
Subspecies: A. (A.) isthmica isthmica
 Heterostropha - Architectonicidae
Architectonica kartseni sundial
Subspecies: A. (A.) nobilis karsteni