18 m above base, stream bed of Arroyo Las Pulgas, 600 m N of Santiago Ixtaltepec: Osagean, Mexico

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Rhynchonellata - Spiriferinida - Syringothyrididae
17 individuals
pedicle valves (7 external molds, 9 internal molds, and1 external impression) and brachial valves (2 external molds and 1 external impression).
Rhynchonellata - Spiriferinida - Punctospiriferidae
16 individuals
9 external impressions and 7 internal molds of pedicle valves, 6 external impressions and 3 internal molds of brachial valves, and 1 specimen that shows the posterior part of an internal mold of 1 specimen.
Rhynchonellata - Spiriferida - Elythidae
15 individuals
2 whole specimens with articulated valves; 2 external impressions and 3 internal molds of pedicle valves; 8 internal molds of brachial valves; 11 fragments of internal molds of pedicle valves; and 1 fragment of an external impression.
Rhynchonellata - Athyridida - Athyrididae
Actinoconchus lamellosus (Léveillé 1835)
10 individuals
5 juvenile forms in different developmental stages, 5 internal molds of pedicle valves (3 fragmented and 2 nearly complete), 1 internal mold of a brachial valve, 1 external impression of a pedicle valve, and 4 external impressions of brachial valves.
Rostroconchia - Conocardiida - Conocardiidae
Quiroz-Barroso et al. 2000 3 individuals
see common names

Geography
Country:Mexico State/province:Oaxaca County:Nochixtlán
Coordinates: 17.6° North, 97.1° West (view map)
Paleocoordinates:23.4° South, 80.4° West (Wright 2013)
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period: Carboniferous Epoch: Mississippian
10 m.y. bin: Carboniferous 1-2
Key time interval: Osagean
Age range of interval: 351.9 - 342.9 m.y. ago
Stratigraphy
Formation:Santiago
Stratigraphic resolution:formation
Stratigraphy comments: 18 meters above formation base.
Lithology and environment
Primary lithology: "limestone"
Lithology description: gray calcarenite (); The revised Santiago Formation, as defined herein, is characterized in its lower part by limestone containing tabulate coral banks associated with brachiopods and demosponges belonging to the order Lithistida. These communities are similar to those found in several ‘Osagean’ outcrops in France (D. Vachard, pers. comm.). The reef banks are interbedded with calcareous sandstone nearly 12 m thick that contains the same fossil association. The upper part of the unit is approximately 55 m thick and contains most of the brachiopods described herein.
Environment:carbonate indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:some macrofossils
Reason for describing collection:taxonomic analysis
Collection method comments: FCMP specimens
Taxonomic list comments:The calcarenite has many bryozoans, crinoids, rugose and tabulate corals, gastropods, brachiopods, a few pelecypods, and the rostroconchs reported in this study. Navarro (1997) and Navarro and Sour-Tovar (in press) identified the brachiopods Actinoconchus lamellosus and Torynifer pseudolineatus
Metadata
Also known as:Las Pulgas wash bed, 600 m north of the town of Santiago.
Database number:67167
Authorizer:P. Wagner Enterer:P. Wagner
Modifier:P. Wagner Research group:marine invertebrate
Created:2006-11-11 12:01:14 Last modified:2025-02-22 15:12:02
Access level:the public Released:2006-11-11 12:01:14
Creative Commons license:CC0
Reference information

Primary reference:
19157. D. Navarro-Santillan, F. Sour-Tovar, and E. Centeno-Garca. 2002. Lower Mississippian (Osagean) brachiopods from the Santiago Formation, Oaxaca, Mexico: stratigraphic and tectonic implications. Journal of South American Earth Sciences 15(3):327-336 [P. Wagner/P. Wagner]

Secondary references:

11601 S. A. Quiroz-Barroso, J. Pojeta, F. Sour-Tovar and S. Morales-Soto. 2000. Pseudomulceodens: a Mississippian rostroconch from Mexico. Journal of Paleontology 74(6):1184-1186 [P. Wagner/P. Wagner/P. Wagner]