Lagunitas [Lomitos Cgl, Talara Fm]: Bartonian, Peru

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Discocyclinidae
Scaphopoda - Dentaliida - Dentaliidae
Gastropoda - Heterostropha - Mathildidae
Gastropoda - Epitoniidae
Gastropoda - Neogastropoda - Buccinidae
Gastropoda - Neogastropoda - Melongenidae
Gastropoda - Neogastropoda - Fasciolariidae
Gastropoda - Neogastropoda
Gastropoda - Neogastropoda - Olividae
Gastropoda - Neogastropoda - Harpidae
Gastropoda - Neogastropoda - Volutidae
Gastropoda - Cypraeidae
Bivalvia - Carditida - Carditidae
Venericardia sp. Lamarck 1801
Bivalvia - Poromyida - Verticordiidae
Verticordia sp. Sowerby 1844
Bivalvia - Cardiida - Cardiidae
Cardium sp. Linnaeus 1758
Rhynchonellata - Terebratulida - Terebratulidae
see common names

Geography
Country:Peru State/province:Piura
Coordinates: 4.7° South, 81.3° West (view map)
Paleocoordinates:4.6° South, 69.2° West (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Paleogene Epoch: Eocene
Stage: Bartonian 10 m.y. bin: Cenozoic 3
Key time interval: Bartonian
Age range of interval: 41.03 - 37.71 m.y. ago
Stratigraphy
Formation:Talara Member:Lomitos Conglomerate
Stratigraphic resolution:group of beds
Stratigraphy comments: Regarded as lower Upper Eocene on the basis of faunal similarity. Foraminifera suggest an upper Eocene age. Olsson states that the Talara and Saman rocks can be referred to the Upper Eocene and in terms of the European section, to the Bartonian and Ludian.....respectively? In most places the Talara Formation can be divided into three members, a lower shale (Talara Shale), a middle sandstone (Talara Sandstone), and an upper shale (Pozo Shale). In a complete section the Talara Formation has an average thickness of about 2800 ft. The collection is derived from a sandy basal layer known as the Lomitos Conglomerate in the Talara Shale member, which can reach a thickness of 400 ft or more. From a zone of coarse, black, quartzitic cobbles in arenaceous shales, resting upon eroded Restin shales.
Lithology and environment
Primary lithology:coarse,pebbly,black poorly lithified sandy "shale"
Includes fossils?Y
Includes fossils?Y
Lithology description: Coarse, black, quartzitic cobbles in arenaceous shales
Environment:coastal indet.
Geology comments: Appears to be shelfal siliciclastic environment judging from faunal composition.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:selective quarrying,field collection
Reason for describing collection:taxonomic analysis
Collection method comments: No museum repositories are reported, but material may presumably be the AMNH of PRI collections. Because of uncertaintly this field is left ommited.
Taxonomic list comments:Exhaustive for Mollusca.
Metadata
Database number:52528
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2005-08-10 12:21:42 Last modified:2025-02-22 15:12:02
Access level:the public Released:2005-08-10 12:21:42
Creative Commons license:CC0
Reference information

Primary reference:
14126. A. A. Olsson. 1930. Contributions to the Tertiary Paleontology of Northern Peru: Part 3, Eocene Mollusca. Bulletins of American Paleontology 17(62):1-164 [A. Miller/A. Hendy/A. Hendy]