PPP# 35 - Mattress Factory [lower Gatun Fm] (Miocene of Panama)

Where: Colon, Panama (9.4° N, 79.8° W: paleocoordinates 9.1° N, 78.5° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: lower Gatun Member (Gatun Formation), Tortonian (11.6 - 7.2 Ma)

• STRATIGRAPHIC RELATIONS: The Gatun Fm rests unconformably on formations of different ages in different parts of the Panama Canal Basin. To the east of Colon, the Gatun Fm rests nonconformably on unamed Cretaceous volcanics. To the west of Colon, including several islands in Lake Gatun, the Gatun Fm rests with angular unconformity on the upper Oligocene Caimito Fm. AGE: Tortonian based on more recent dating (Hendy, 2012). Sr dating for nearby sections indicates an age of approximately 10.5 Ma (Hendy, unpublished data).

• bed-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified, bioturbated siltstone

• ENVIRONMENT: from Collins et al. (1999), open, inner neritic.
• GENERAL LITHOLOGY: Siltstone. LITHIFICATION: lithification data not reported, but assumed to be unlithified based on observation of specimens in Woodring (1957-1982).

Size class: macrofossils

Collected in 1986; reposited in the NMB

Collection methods: bulk, sieve,

• COLLECTORS: unknown (PPP staff), 1986. REPOSITORIES: Naturhistorisches Museum Basel (NMB),

Primary reference: A. H. Cheetham and J. B. C. Jackson. 1999. Neogene cheilostome Bryozoa of tropical America: Comparison and contrast between the Central American Isthmus (Panama, Costa Rica) and the north-central Caribbean (Dominican Republic). Bulletin of the American Museum of Natural History (357)159-192 [A. Hendy/A. Hendy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 145580: authorized by Austin Hendy, entered by Austin Hendy on 06.06.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for bryozoa. NOMENCLATURE: modern nomenclature, though only identified to subgenus resolution. IDENTIFIER: presumably identified by J. Jackson, J. Todd, H. Fortunato, and P. Jung.
Globothalamea
 Rotaliida - Discorbidae
 Rotaliida - Cibicididae
 Rotaliida - Nonionidae
Foraminifera
 Rotalioidea - Haynesinidae
 Rotalioidea - Elphidiidae
 Buliminacea - Reusselidae
 Rotaliina - Bolivinidae
 Rotaliacea - Rotaliidae
Gymnolaemata
 Cheilostomata - Candidae
 Cheilostomata - Steginoporellidae
 Cheilostomata - Thalamoporellidae
 Cheilostomata - Metrarabdotosidae
 Cheilostomata - Gemelliporellidae
 Cheilostomata - Margarettidae
 Cheilostomata - Sertellidae