PBDB Collection

Dicoelosia-Skenidioides Community, Merida Andes: Ludlow, Venezuela

List of taxa

Where & when

Geology

Taphonomy & methods

Metadata & references

Taxonomic list

Strophomenata - Orthotetida - Chilidiopsidae

	? Chilidiopsis sp.	Boucot et al. 1972
Strophomenata - Strophomenida - Strophochonetidae

	Shagamella ludloviensis	Boucot et al. 1972

	? Protochonetes sp. Muir-Wood 1962	Boucot et al. 1972
Strophomenata - Strophomenida - Strophonellidae

	Strophonella sp. Hall 1879	Boucot et al. 1972

	Strophonella cf. haueri (Barrande 1848)	Boucot et al. 1972
Strophomenata - Strophomenida - Rafinesquinidae

	Leptaena sp. Dalman 1828	Boucot et al. 1972
	sp. D

	Leptaena cf. delicata Amsden 1949	Boucot et al. 1972
Strophomenata - Strophomenida - Amphistrophiidae

	Amphistrophia sp. Hall and Clarke 1892	Boucot et al. 1972
	sp. B

	Amphistrophia cf. funiculata (M'Coy 1846)	Boucot et al. 1972
Strophomenata - Strophomenida - Shaleriidae

	Shaleria sp. Caster 1939	Boucot et al. 1972
Strophomenata - Strophomenida - Leptostrophiidae

	Brachyprion cf. attenuata Amsden 1951	Boucot et al. 1972
	genus name in quotes

	Leptostrophia sp. Hall and Clarke 1892	Boucot et al. 1972
	sp. B; genus name in quotes
Rhynchonellata - Pentamerida - Parastrophinidae

	? Anastrophia sp. Hall 1867	Boucot et al. 1972
Rhynchonellata - Pentamerida - Gypidulidae

	Gypidula cf. dudleyensis	Boucot et al. 1972

	Gypidula sp. Hall 1867	Boucot et al. 1972
Rhynchonellata - Athyridida - Rhynchospirinidae

	Rhynchospirina sp. Schuchert and LeVene 1929	Boucot et al. 1972
	genus name in quotes
Rhynchonellata - Athyridida - Anoplothecidae

	Coelospira cf. saffordi	Boucot et al. 1972
Rhynchonellata - Athyridida - Nucleospiridae

	Nucleospira sp. Hall 1859	Boucot et al. 1972
Rhynchonellata - Athyridida - Meristellidae

	Meristina sp. Hall 1867	Boucot et al. 1972
Rhynchonellata - Athyridida - Meristidae

	Merista sp. Suess 1851	Boucot et al. 1972
Rhynchonellata - Protorthida - Skenidiidae

	Skenidioides sp. Schuchert and Cooper 1931	Boucot et al. 1972
Rhynchonellata - Orthida - Hesperorthidae

	Dolerorthis sp. Schuchert and Cooper 1931	Boucot et al. 1972

	Ptychopleurella sp. Schuchert and Cooper 1931	Boucot et al. 1972
Rhynchonellata - Orthida - Rhipidomellidae

	Dalejina sp. Havlicek 1953	Boucot et al. 1972
Rhynchonellata - Orthida - Dalmanellidae

	Isorthis sp. Kozlowski 1929	Boucot et al. 1972
	sp. C

	Isorthis cf. arcuaria (Hall and Clarke 1892)	Boucot et al. 1972

	Protocortezorthis sp.	Boucot et al. 1972

	Resserella sp. Bancroft 1928	Boucot et al. 1972
Rhynchonellata - Orthida - Dicoelosiidae

	Dicoelosia sp. King 1850	Boucot et al. 1972
Rhynchonellata - Atrypida - Atrypidae

	Atrypa reticularis (Linnaeus 1758)	Boucot et al. 1972
	species name in quotes
Rhynchonellata - Atrypida - Lissatrypidae

	? Australina sp.	Boucot et al. 1972
Rhynchonellata - Spiriferida - Delthyrididae

	Delthyris sp. Dalman 1828	Boucot et al. 1972
	sp. A

	Howellella sp. Kozlowski 1946	Boucot et al. 1972
Rhynchonellata - Spiriferida - Cyrtiidae

	Cyrtia sp. Dalman 1828	Boucot et al. 1972

	Eospirifer sp. Schuchert 1913	Boucot et al. 1972

	Striispirifer cf. plicatella	Boucot et al. 1972

	? Striispirifer sp. Cooper and Muir-Wood 1951	Boucot et al. 1972
Rhynchonellata - Rhynchonellida - Hebetoechiidae

	Sphaerirhynchia sp. Cooper and Muir-Wood 1951	Boucot et al. 1972
	sp. C
Rhynchonellata - Rhynchonellida - Trigonirhynchiidae

	? Ancillotoechia sp. Havlicek 1959	Boucot et al. 1972
Rhynchonellata - Rhynchonellida - Rhynchotrematidae

	Stegerhynchus aff. praecursor (Foerste 1909)	Boucot et al. 1972
see common names

Geography

Country:	Venezuela
Coordinates:	8.6° North, 71.2° West (view map)
Paleocoordinates:	62.0° South, 78.8° West (Wright 2013)
Basis of coordinate:	based on political unit
Geographic resolution:	basin

Time

Period:	Silurian	Epoch:	Ludlow
10 m.y. bin:	Silurian 2
Key time interval:	Ludlow
Age range of interval:	426.7 - 422.7 m.y. ago

Stratigraphy

Formation:	El Horno
Stratigraphic resolution:	formation
Stratigraphy comments: Ludlow age based on presence of Amphistrophia cf. funiculata, "Brachyprion" cf. attenuata, Shagamella ludloviensis, and Coelospira cf. saffordi (Boucot et al. 1972--PBDB ref. 7026). This was originally part of the Caparo Formation, but that is now restricted to the Sandbian.

Lithology and environment

Primary lithology:	gray mudstone
Includes fossils?	Y
Lithology description: "Most of the shells are disarticulated and occur in a gray mudstone matrix as either coquinas or as shells scattered through poorly bedded matrix."
Environment:	marine indet.
Geology comments: "BA 4-5...A normal level of turbulence and oxygenation is indicated by the data."

Taphonomy

Modes of preservation:	body
Size of fossils:	macrofossils

Collection methods and comments

Reason for describing collection:	paleoecologic analysis
Collection method comments: Table 5 of Boucot et al. 1973 (PBDB ref. 7026).

Metadata

Database number:	25067
Authorizer:	M. Foote	Enterer:	M. Foote
Modifier:	P. Wagner	Research group:	marine invertebrate
Created:	2002-08-27 12:47:49	Last modified:	2025-02-22 15:12:02
Access level:	the public	Released:	2002-08-27 12:47:49
Creative Commons license:	CC0

Reference information

Primary reference:

7007.

A. J. Boucot, J. L. Benedetto, Y. Grahn, J. H. G. Melo, T. M. Sanchez and B. A. Waisfeld. 1999. South American marine Silurian communities. In A. J. Boucot and J. D. Lawson (eds.), Paleocommunities--a case study from the Silurian and Lower Devonian 841-848 [M. Foote/M. Foote/M. Foote]

Secondary references:

7026

A. J. Boucot, J. G. Johnson, and R. Shagam. 1972. Braquiopodos siluricos de los Andes meridenos de Venezuela. Boletin de Geologica Publicacion Especial (5)585-727 [M. Foote/M. Foote/M. Foote]