Hidaka Group, Naizawa Fm, Motourakawa River, Japan: Carnian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Stenolaemata - Trepostomata - Heterotrypidae
R
Stenolaemata - Trepostomida - Dyscritellidae
R
Stenolaemata - Trepostomida - Stenoporidae
VA
Cyclostomi - Conodontophorida - Gondolellidae
Neogondolella polygnathiformis (Budurov and Stefanov 1965)
see common names

Geography
Country:Japan
Coordinates: 42.2° North, 142.8° East (view map)
Paleocoordinates:22.4° North, 146.6° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Time
Period: Triassic Epoch: Late Triassic
Stage: Carnian 10 m.y. bin: Triassic 3
*Period:Late/Upper Triassic
*International age/stage:Early/Lower Carnian
Key time interval: Carnian
Age range of interval: 237 - 227.3 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Hidaka Formation:Naizawa
Stratigraphic resolution:bed
Lithology and environment
Primary lithology:brown,gray lithified "limestone"
Includes fossils?Y
Lithology description: The limestone consists of massive micrite, pale brownish gray to pale gray in color, includes small greenish angular hyaloclastitic fragments. The bryozoans occur in the massive part of the limestone without hyaloclastitic fragments.
Environment:marine indet.
Taphonomy
Size of fossils:mesofossils,microfossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Taxonomic list comments:R = rare
VA = very abundant
Metadata
Also known as:DESC-79018, DESC-79009a, DESC-79007. DESC 79008, DESC-79009b
Database number:32669
Authorizer:D. Bottjer Enterer:C. Powers
Modifier:C. Powers Research group:marine invertebrate
Created:2003-07-11 15:29:36 Last modified:2025-02-22 15:12:02
Access level:authorizer only Released:2005-07-11 15:29:36
Creative Commons license:CC0
Reference information

Primary reference:
8783. S. Sakagami and A. Sakai. 1979. Triassic bryozoans from the Hidaka Group in Hokkaido, Japan. Trans. Proc. Palaeont. Soc. Japan, N. S. 114:77-86 [D. Bottjer/C. Powers/C. Powers]