Hosselkus Limestone of Redding (Eastern Klamath terrane): Late Triassic, California

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Rhodophyceae - Solenoporaceae
Parachaetetes sp. Deninger 1906
see common names

Geography
Country:United States State/province:California County:Shasta
Coordinates: 40.8° North, 122.0° West (view map)
Paleocoordinates:15.7° North, 57.7° West
Time
Period: Triassic Epoch: Late Triassic
10 m.y. bin: Triassic 3-4
Key time interval: Late Triassic
Age range of interval: 237 - 201.4 m.y. ago
Stratigraphy
Stratigraphy comments: Upper Carnian (based on Conodonts)
Lithology and environment
Primary lithology: lithified "limestone"
Lithology description: These outcrops are part of the Eastern Klamath terrane, a sequence of Palaeozoic and Mesozoic island arc deposits that were built upon oceanic crust (Irwin 1977) and accreted onto the American continental margin during the Mesozoic (Coney et al. 1980). It is worth to notice that the best-preserved limestone units crop out in the Shasta Lake area and not at the type locality (Taylorsville, Plumas County). In the Shasta area, the lower part of the Hosselkus Limestone shows a great variety of open basin facies (e.g., deep environment with radiolarians, condensed levels of halobid-like bivalves, crinoids packstone, calciturbidites with ammonoids). After a progressive transition toward shallower basinal facies, the whole succession is covered by several meters of breccia composed of centimetric to decimetric limestone clasts within a radiolarian-rich fine matrix. The limestone clasts derive from an Upper Triassic carbonate platform that no longer exists. Facies mostly reflect platform top to foreslope environments, with mud-dominated and grain-dominated elements associated with shallow-water organisms; the last are observed in millimetric to decametric reworked elements, and notably comprise the here described algae and coral-rich facies. Conodonts recovered in all three types of facies indicate a late Carnian age
Environment:basinal (carbonate)
Geology comments: Debris-dominated foreslope. Shallow organisms reworked in open basin environment as centimetric breccia; matrix indicates a deep environment with radiolarians
Taphonomy
Modes of preservation:body,original aragonite,replaced with calcite
Size of fossils:mesofossils
Collection methods and comments
Collection excludes:all macrofossils
Reason for describing collection:taxonomic analysis
Metadata
Also known as:Reef facies locality (Eastern Klamath terrane)
Database number:234339
Authorizer:W. Kiessling Enterer:T. Jujihara
Research group:marine invertebrate
Created:2024-03-30 10:18:18 Last modified:2024-03-30 10:18:18
Access level:the public Released:2024-03-30 10:18:18
Creative Commons license:CC BY
Reference information

Primary reference:
87972. I. I. Bucur, S. Rigaud, N. Del Piero, A. Fucelli, E. Heerwagen, C. Peybernes, G. Peyrotty, C. Verard, J. Chablais and R. Martini. 2020. Upper Triassic calcareous algae from the Panthalassa Ocean. Rivista Italiana di Paleontologia e Stratigrafia 126(2):499-540 [W. Kiessling/T. Jujihara]