May, 1987
Radiolarian age of the Shiriya Group in Aomori Prefecture, northeast Japan
Fossils
- Volume
- 42
- Number
- First page
- 7
- Last page
- 13
- Language
- Japanese
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.14825/kaseki.42.0_7
- Publisher
- Palaeontological Society of Japan
Fossil evidence of radiolarians reveals the age of the Shiriya Group (olistostrome facies) in the North Kitakami Belt (s. l.). Some olistoliths of chert are Early Jurassic and Middle-Late Jurassic in age. A tuffaceous mudstone sample contains the following radiolarians; Pantanellium lanceola (Parona), Parvicingula boesii (Parona), Pseudodictyomitra sp. cf. P. carpatica (Lozyniak) and others. The association of the radiolarians indicates that the examined sample is late Tithonian-earliest Cretaceous in age. It is not clear whether the tuffaceous mudstone represents a matrix of the olistostrome or it is also an olistolith itself within the olistostrome. It is certain, however, that the formation of the olistostrome continued during late Tithonian-earliest Cretaceous or later in the North Kitakami Belt (s. l.).
- Link information
- ID information
-
- DOI : 10.14825/kaseki.42.0_7
- ISSN : 0022-9202
- CiNii Articles ID : 110002703512
- CiNii Books ID : AN00041606