Locality 208 - Chagres Sandstone (Miocene of Panama)

Also known as USGS #8437

Where: Panama (9.6° N, 79.5° W: paleocoordinates 9.4° N, 78.6° 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 W.T. Thompson and W.P. Woodring (1943). 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 60702: 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.
Bivalvia
 Arcida - Arcidae
Anadara (Rasia) honensis Olsson 1922 ark
Subspecies: A. (R.) honensis adiaphora
 Pectinida - Pectinoidae
"Cryptopecten cactaceus" = Chagrepecten cactaceus3, Amusium mimyum3
"Cryptopecten cactaceus" = Chagrepecten cactaceus3 Dall 1898 scallop
Amusium mimyum3 Woodring 1982 scallop
 Nuculida - Nuculidae
Acila (Acila) isthmica Brown and Pilsbry 1911 divaricate nutclam
Subspecies: A. (A.) isthmica isthmica
Gastropoda
 Ptenoglossa - Epitoniidae
 Neogastropoda - Cancellariidae
Trigonostoma sp. Blainville 1827 snail
Bivetiella dariena2 Toula 1908 snail
Subspecies: C. (C.) cf. epistomifera
"Cancellaria (Pyruclia) diadela" = Pyruclia scheibei Anderson 1929 snail
Cancellaria (Cancellaria) sp. Lamarck 1799 snail
 Neogastropoda - Drilliidae
? Clathrodrillia sp. Dall 1918 snail
 Neogastropoda - Turridae
Scobinella ecuadoriana Olsson 1964 turrid
"Pleurofusia cf. fenimorei" = Fusiturricula fenimorei Bartsch 1934 turrid
 Neogastropoda - Conidae
"Conus tortuosostriatus" = Conasprella (Dalliconus) sauros, Conus imitator
"Conus tortuosostriatus" = Conasprella (Dalliconus) sauros Garcia 2006 cone shell
[entered as Conus tortuosotriatus]
Conus imitator Brown and Pilsbry 1911 cone shell
 Neogastropoda - Pseudomelatomidae
"? Darbya (? Buridrillia) sp." = Buridrillia
"? Darbya (? Buridrillia) sp." = Buridrillia Olsson 1942 snail
 Neogastropoda - Terebridae
Strioterebrum sp. Sacco 1891 auger snail
 Stromboidea - Strombidae
Strombus ? gatunensis Toula 1908 conch
 Naticoidea - Naticidae
Stigmaulax guppiana Toula 1909 moon snail
 Tonnoidea - Personidae
Distorsio ? decussata Valenciennes 1832 snail
Subspecies: D. decussata gatunensis
 Tonnoidea - Cassidae
"Bathygalea (Miogalea) hadra" = Echinophoria hadra
"Bathygalea (Miogalea) hadra" = Echinophoria hadra Woodring and Olsson 1957 snail
 Architectonicoidea - Architectonicidae
Architectonica kartseni1 sundial
Subspecies: A. (A.) nobilis karsteni
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium (Fissidentalium) grandanum tusk shell
Subspecies: D. (F.) grandanum esmeraldum