Quebrada del Profeta ravines, G. Chong (Jurassic of Chile)

Where: Chile (24.7° S, 69.1° W)

• Paleocoordinates: 31.3° S, 24.9° W (Wright 2013)

• coordinate estimated from map

When: Oxfordian (161.5 - 154.8 Ma)

• type horizon: uncertain, probably cordatum zone, early Oxfordian

Environment/lithology: offshore; black, sandy shale and concretionary, sandy shale

• Palaeogeographic maps for the Oxfordian place the Chilean locality close to the western margin of Gondwana (Fig. 2). The fishes indicate a near-coast environment (pycnodontiform and semionotid) with some open-sea elements (pachycormid fishes, ichthyosaurs). The clusters of oysters and the occurrence of decapod crustaceans point to shallow water depths, possibly below 30 m and certainly above 100 m.
• The Jurassic is folded tectonically so that the fossil horizons are repeated in the ravines from east to west (Schultze 1989, fig. 2). Schultze (1989, fig. 3) gave a section through the sequence showing the occurrence of ten horizons with concretions in black sandy shales. The coleoid-bearing concretions were collected from the main fossil bearing horizon 10. These concretions are calcareous (Schultze 1989, fig. 18) and occur in calcite-containing sandy shales.

Size classes: macrofossils, mesofossils

Preservation: replaced with phosphate

Collection methods: The coleoid-bearing concretions were collected from the main fossil bearing horizon 10.

Primary reference: D. Fuchs and H.-P. Schultze. 2008. Trachyteuthis covacevichi n. sp., a Late Jurassic Palaeopacific coleoid cephalopod. Fossil Record 11(1):39-49 [B. Seuss/B. Seuss]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 215835: authorized by Barbara Seuss, entered by Barbara Seuss on 25.11.2020

Creative Commons license: CC0 (CC0)

Taxonomic list

• the list contains information added by the authors on various taxa; however, only the coleoid is described in this manuscript, data on other fossils derive from literature and published findings by the authors
Show authors, comments, and common names
unclassified
  -
Atacamichtys sp., Teleostia indet., Varasichtys sp., Bobbichtys sp., Chongichtys sp., Oysters indet.
Teleostia indet.
different species
Bivalvia
 Ostreida - Posidoniidae
"Posidonia" sp.
"Posidonia" sp. Bronn 1828 oyster
Cephalopoda
 Octopoda - Trachyteuthididae
Trachyteuthis covacevichi n. sp.
Trachyteuthis covacevichi n. sp. octopus
holotype: SGO.PI.6437a + b; SGO.PI.6438
 Ammonoidea -
Ammonoidea indet.
 Ammonitida - Aspidoceratidae
Euaspidoceras sp.
Euaspidoceras sp. Spath 1931 ammonite
 Ammonitida - Perisphinctidae
Perisphinctes sp.
Perisphinctes sp. Waagen 1869 ammonite
Lingulata
 Lingulida -
Lingulida indet.
Lingulida indet. Waagen 1885
Malacostraca
 Decapoda - Stenochiridae
Chilenophoberus atacamensis
Chilenophoberus atacamensis Chong and Forster 1976 decapod
Actinopteri
 Pholidophoriformes - Pholidophoridae
? Pholidophorus domeykanus
 Pachycormiformes -
Domeykos sp., Protoclupea sp.
 Pachycormiformes - Pachycormidae
cf. Hypsocormus sp.
cf. Hypsocormus sp. Wagner 1863
Hypsocormus-like pachycormids
 Lepisosteiformes -
Lepidotes sp.
Lepidotes sp. Agassiz 1832 gar
 Pycnodontiformes -
Gyrodus sp.
Gyrodus sp. Agassiz 1833
Reptilia
  -
Reptilia indet.
Reptilia indet. Laurenti 1768 reptile
crocodiles and ichthysaurs