Woodring Loc. 85 - Madden Basin [Alhajuela Fm] (Miocene of Panama)

Also known as USGS 5903

Where: Panama (9.2° N, 79.6° W: paleocoordinates 8.8° N, 77.8° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Alhajuela Formation, Middle Miocene (16.0 - 11.6 Ma)

• The Caimito Formation in Madden Basin includes both Oligocene and lower Miocene deposits. The thickness in the basin appears to be 450 m. The deposits now referred to the Caimito Formation were initially designated the Culebra Formation, Emperaqdor Limestone, Caimito Formation, and Gatun Formation. Five members are tentatively recognized in the Caimito Formation. Two members are grouped as the lower part, the upper three members form the upper part. In stratigraphic order these include: basal calcareous sandstone-siltstone member (200 m) overlies the Bohio Formation, or laps onto the Gatuncillo Formation; the pyroclastic-clay member (50 m); Chilibrillo Limestone member (150 m); calcareous sandstone member (30 m); Alhajuela Sandstone member (85 m). The lower part of the Caimito Fm (2 basal members) is late Oligocene, the upper part (3 upper members) is early Miocene; Alhajuela Sandstone revised to formation rank in subsequent publications.

• bed-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified, fine-grained, coarse, tuffaceous sandstone

• No paleoenvironmental data reported.
• Massive, fine-coarse-grained tuffaceous sandstone.

Size class: macrofossils

Reposited in the USNM

Collection methods: quarrying,

• Collected by Reeves and Ross (1930). Material is also held (but not specified for any specific collection) at Stanford University, Acad. Nat. Sci. Phil., Corenell University, PRI, U. Cal. and Cal. Acad. Sci. Locality now unaccessible (submerged).

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 42598: authorized by Austin Hendy, entered by Austin Hendy on 03.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for gastropoda.
Maxillopoda
 Sessilia - Balanidae
"Balanus glyptopoma" = Arossia glyptopoma1
"Balanus glyptopoma" = Arossia glyptopoma1 Pilsbry 1916 barnacle
Bivalvia
 Arcida - Arcidae
 Pectinida - Pectinoidae
"Flabellipecten gatunensis" = Leopecten gatunensis4, Argopecten venezuelanus4
"Flabellipecten gatunensis" = Leopecten gatunensis4 Toula 1909 scallop
Subspecies: Flabellipecten gatunensis gatunensis
Argopecten venezuelanus4 calico scallop
 Ostreida - Pinnidae
Atrina sp.3 Gray 1842 oyster
 Pholadida - Corbulidae
Caryocorbula sp.4 Gardner 1926 clam
 Cardiida - Veneridae
Dosinia (Dosinia) aff. ponderosa4 Gray 1838 venus clam
Subspecies: Dosinia (Dosinia) aff. ponderosa titan
Pitar (Pitar) cf. coroanus4 Hodson 1927 venus clam
"Macrocallista (Paradione) maculata" = Macrocallista maculata4 Linnaeus 1758 venus clam
 Cardiida - Cardiidae
"Laevicardium laevigatum" = Laevicardium serratum4, Dinocardium robustum4
"Laevicardium laevigatum" = Laevicardium serratum4 Linnaeus 1758 cockle
Dinocardium robustum4 Lightfoot 1786 cockle
 Pholadomyida - Pholadomyidae
Pholadomya falconensis4 Hodson and Hodson 1927 clam
Gastropoda
 Vermetoidea - Vermetidae
Vermetidae indet.2 Rafinesque 1815 worm shell