Bed 33, Section 1 - Lajas (Conor Fm): Turonian, Peru
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda
- Ammonitida
- Coilopoceratidae
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Coilopoceras sp.
Hyatt 1903
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Hoplitoides sp.
von Koenen 1898
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Echinoidea
- Orthopsidae
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Orthopsis titicacana
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see common names |
Geography
Country: | Peru | State/province: | Cajamarca |
Coordinates: | 6.6° South, 78.7° West (view map) | ||
Paleocoordinates: | 12.4° South, 55.5° West | ||
Basis of coordinate: | based on nearby landmark | ||
Geographic resolution: | outcrop |
Time
Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
Stage: | Turonian | 10 m.y. bin: | Cretaceous 6 |
Key time interval: | Turonian | ||
Age range of interval: | 93.90000 - 89.80000 m.y. ago |
Stratigraphy
Geological group: | Quillquinan | Formation: | Conor | ||
Local section: | Lajas | Local bed: | 367 m | ||
Local order: | top to bottom | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: Collection from a 12 m thick marl unit, immediately above contact with Romiron Fm (late Cenomanian). The formation is 90 m thick at its type section; 157 m thick at this section. The formation conatins an early Turonian age based on ammonite biostratigraphy. |
Lithology and environment
Primary lithology: | ferruginous,shelly/skeletal,brown,gray,yellow lithified marl |
Secondary lithology: | shelly/skeletal,brown "limestone" |
Includes fossils? | Y |
Includes fossils? | Y |
Lithology description: Marl, yellowish gray, slightly ferruginous, nodular, weathers brownish, fossiliferous, with interbeds of thick-bedded, massive, fossiliferous light brown limestone. | |
Environment: | marine indet. |
Glacial or sequence phase: | transgressive |
Geology comments: The Conor Fm represents records the deepening of waters with diminution of faunas and increase in calcareous materials, chaing from shales into limestones below and above the unit. No paleoenvironmental interpretation provided. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Collection methods and comments
Collection methods: | selective quarrying,field collection |
Reason for describing collection: | general faunal/floral analysis |
Museum repositories: | AMNH |
Collection method comments: Collections reposited at AMNH. | |
Taxonomic list comments:Taxonomic list compiled by the author during 1951-1952. Nomenclature should therefore be somewhat antiquated, though systematics reflect supervision of Normal Newell, Columbia University and AMNH paleontologists. |
Metadata
Database number: | 56900 | ||
Authorizer: | A. Hendy | Enterer: | A. Hendy |
Modifier: | A. Hendy | Research group: | marine invertebrate |
Created: | 2005-11-28 18:03:08 | Last modified: | 2013-11-25 13:37:23 |
Access level: | the public | Released: | 2005-11-28 18:03:08 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
15338. | V.E. Benavides-Caceres. 1956. Cretaceous system in northern Peru. Bulletin of the American Museum of Natural History 108(4):1-493 [A. Miller/A. Hendy] |