ammonites
LA 3, Las Aguaditas North Section, southwest of San José da Jáchal (Ordovician of Argentina)

Where: San Juan, Argentina (30.3° S, 68.8° W: paleocoordinates 34.5° S, 132.8° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Las Aguaditas Formation, Costonian (460.9 - 457.5 Ma)

• Nemagraptus gracilis zone

• bed-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; lithified marl and claystone

• marlstones in slumps (Fig. 2).

Size class: macrofossils

Primary reference: G. D. Edgecombe, B. D. E. Chatterton, N.E. Vaccari and B.G. Waisfield. 1999. Ordovician cheirurid trilobites from the Argentine Precordillera. Journal of Paleontology 73(6):1155-1175 [A. Miller/S. Kolbe] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 115231: authorized by Arnold Miller, entered by Sarah Kolbe on 31.08.2011

LA 3, Las Aguaditas North Section, southwest of San José da Jáchal: Costonian, Argentina

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Trilobita - Phacopida - Cheiruridae
Nieszkowskia jakei Edgecombe et al. 1999
see common names

Geography
Country:Argentina State/province:San Juan
Coordinates: 30.3° South, 68.8° West (view map)
Paleocoordinates:34.5° South, 132.8° West
Basis of coordinate:based on nearby landmark
Geographic resolution:local area
Time
Period:Ordovician Epoch:Late/Upper Ordovician
Stage:early Late Ordovician 10 m.y. bin:Ordovician 4
Key time interval:Costonian
Age range of interval:460.9 - 457.5 m.y. ago
Stratigraphy
Formation:Las Aguaditas
Local section:Las Aguaditas North Local bed:267 m
Local order:bottom to top
Stratigraphic resolution:bed
Stratigraphy comments: Nemagraptus gracilis zone
Lithology and environment
Primary lithology: lithified marl
Secondary lithology: claystone
Lithology description: marlstones in slumps (Fig. 2).
Environment:deep subtidal shelf
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:some macrofossils
Reason for describing collection:taxonomic analysis
Metadata
Database number:115231
Authorizer:A. Miller Enterer:S. Kolbe
Modifier:S. Kolbe Research group:marine invertebrate
Subset of collection #:8776
Created:2011-08-31 05:02:46 Last modified:2011-08-31 06:15:11
Access level:the public Released:2011-08-31 05:02:46
Creative Commons license:
Reference information
Primary reference:
37329 G. D. Edgecombe, B. D. E. Chatterton, N.E. Vaccari and B.G. Waisfield. 1999. Ordovician cheirurid trilobites from the Argentine Precordillera. Journal of Paleontology 73(6):1155-1175 [A. Miller/S. Kolbe]