Locality 2, Quebrada de Portachuelo (Permian of Venezuela)

Where: Merida, Venezuela (8.0° N, 71.3° W: paleocoordinates 5.5° S, 34.4° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Palmarito Formation, Kungurian (279.3 - 272.3 Ma)

• Collecting site lay directly within the side wall of the stream bed: the size collected was about 1 m parallel to and 0.5 m perpendicular to bedding. Fusulinids and ammonoids suggest that locality 4 (and underlying localities 1 and 2) are "late Leonardian" (Kungurian) in age. Palmarito Fm contains Perrinites hilli and Parafusulina of Kungurian age.

• bed-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lithified, gray shale and lithified, calcareous siltstone

• Shallow water with low energy, with a soft substrate. Absence of pediculate or cemented brachiopods suggests fine grain size and very soft substrates.
• Petroliferous dark gray shale, with think (ca. 5 cm thick) intercalated lenses of clacerous siltstone. Biomicrite with soft-sediment deformation patches of wackestone or incipient packstone.

Size class: macrofossils

Preservation: permineralized, replaced with calcite

Collection methods: surface (in situ), chemical,

• Size of area collected 1 m parallel to and 0.5 m normal to bedding. Fossils etched from siliceous shales with 52% hydrofluoric acid, which destroyed specimens over ~1 cm and decorticated smaller specimens.

Primary reference: P.R. Hoover. 1981. Paleontology, Taphonomy, and Paleoecology of the Palmarito Formation (Permian of Venezuela). Bulletins of American Paleontology 80(313):1-138 [D. Bottjer/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 41506: authorized by David Bottjer, entered by Matthew Clapham on 15.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Ostracoda
  -
Ostracoda indet. Latreille 1802 ostracod
3 indeterminate species
 Podocopida - Healdiidae
Healdia sp. ostracod
 Podocopida - Acratiidae
? Acratia sp. Delo 1930 ostracod
 Podocopida - Bairdiidae
Bairdia spp. M'Coy 1844 ostracod
Bairdia (sensu lato)
? Ceratobairdia sp. Sohn 1954 ostracod
 Platycopida - Hollinellidae
 Platycopida - Cavellinidae
Cavellina sp. ostracod
Strophomenata
 Productida - Productidae
Productinae indet. Gray 1840
Indeterminate productine fragments
 Productida - Rugosochonetidae
Dyoros acanthopelix n. sp. Hoover 1981
Reflects minimum estimate based on valve ratios
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily
Columnals