Locality 13, mule trail between El Portachuelo and Mucuchachi (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)

• Exotic block, stratigraphic position unknown. Palmarito Fm contains Perrinites hilli and Parafusulina of Kungurian age.

• bed-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; shelly/skeletal, black, gray, silty wackestone

• Soft-substrate bottom, with little relief, below wave base in warm water, perhaps restricted from ready access to open ocean conditions. Bioturbation, if present, was extensive, as bedding was completely homogenized.
• Dense, dark gray to black, petroliferous silty limestone. Compositionally a biomicrite, with dolomite rhombs; texturally a wackestone.

Size class: macrofossils

Preservation: replaced with silica

Collection methods: bulk, chemical, mechanical,

• Prepared by HCl etching, with the small amount of accumulated silt removed by air abrasion.

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 41517: authorized by David Bottjer, entered by Matthew Clapham on 15.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Proetida - Phillipsiidae
Anisopyge ? inornata Girty 1909 trilobite
Bivalvia
 Pectinida - Pseudomonotidae
Pseudomonotis sp. von Beyrich 1862 scallop
 Cardiidia - Sanguinolitidae
Sanguinolites sp. M'Coy 1844 clam
Gastropoda
  -
Gastropoda indet. Cuvier 1797 snail
Holopeiform, low-holopeiform, high-spired, sinistral, and new genus of high-spired
 Euomphalina - Euomphalidae
Discotropis sp. Yochelson 1956 snail
Yochelson 1960
 Euomphalina - Anomphalidae
Anomphalus sp. Meek and Worthen 1866 snail
 Euomphalina - Microdomatidae
Glyptospira sp. Chronic 1952 snail
 Prosobranchia - Meekospiridae
Meekospira sp. Ulrich and Scofield 1897 snail
 Prosobranchia - Goniasmatidae
Goniasma "sp. 1" Tomlin 1930 snail
Goniasma "sp. 2" Tomlin 1930 snail
"Taosia sp." = Stegocoelia (Taosia) Girty 1939 snail
 Prosobranchia - Orthonematidae
Orthonema sp. Meek and Worthen 1862 snail
 Prosobranchia - Palaeostylidae
Kinishbia sp. Winters 1956 snail
 Heterostropha - Donaldinidae
cf. Donaldina sp. Knight 1933 snail
 Neritoidea - Naticopsidae
Naticopsis sp. M'Coy 1844 snail
New subgenus
 Murchisoniina - Gosseletinidae
Apachella sp. Winters 1956 snail
Glabrocingulum sp. Thomas 1940 snail
 Murchisoniina - Lophospiridae
? Worthenia sp. de Koninck 1883 snail
 Pleurotomariacea -
"? Pleurotomariacea indet." = Pleurotomarioidea
"? Pleurotomariacea indet." = Pleurotomarioidea Swainson 1840 snail
Open-coiled
Polyplacophora
  -
Polyplacophora indet. de Blainville 1816 chiton
Plates
Stenolaemata
 Fenestrata -
Fenestrata indet. Astrova and Morozova 1956
Fenestellid forms
Strophomenata
 Productida - Productellidae
Echinauris bella Cooper and Grant 1975
 Productida - Productidae
Spinifrons grandicosta n. sp. Hoover 1981
 Productida - Linoproductidae
? Holotricharina "sp. A" Cooper and Grant 1975
 Productida - Rugosochonetidae
Chonetinetes cf. varians Cooper and Grant 1975
Reflects minimum estimate based on valve ratios
 Orthotetida - Derbyiidae
Derbyia sp. Waagen 1884
Derbyia auriplexa n. sp. Hoover 1981
Rhynchonellata
 Athyridida - Neoretziidae
 Athyridida - Athyrididae
Composita cf. pilula Cooper and Grant 1976
 Terebratulida - Pseudodielasmatidae
? Oligothyrina sp. Cooper 1956
Anthozoa
 Rugosa -
Rugosa indet. horn coral
Solitary corals