Masato Fujita

Academic paper

Memoir of the Fukui Prefecturial Dinosaur Museum

2

3-14

Correlation and age of the vertebrate-bearing horizons in the Tetori Group, which is representative sedimentary succession of the Middle Jurassic to Early Cretaceous in the Inner Zone of the Southwest Japan, have been reexamined with new data. The Tetori Group is divided into the Kuzuryu, Itoshiro, and Akaiwa subgroups in ascending order. The Kuzuryu Subgroup referred to Middle to Late Jurassic on the basis of marine molluscan fossils. The Itoshiro Subgroup contains Late Hauterivian to Early Barremian ammonite, and the upper part of the subgroup yields non-marine molluscan fossils Tatsukawa type Fauna) indicating Hauterivian. The Akaiwa Subgroup conformably overlies the Itoshiro Subgroup and its upper part yields rne Late Barremian non-marine fauna Sebayashi type Fauna). Molluscan assemblages and zircon fission track dating of tuff indicate that terrestrial and freshwater vertebrate fossils including dinosaurs of the Tetori Group are found in the Hauterivian, Late Barremian, and Aptian to Early Albian strata.

Tetori Group, Jurassic, Lower Cretaceous, stratigraphy, fission track dating, dinosaur

English