Translator Disclaimer
1 September 2012 Late Paleozoic Foraminifers from Limestone Blocks and Fragments of the Permian Tsunemori Formation and Their Connection to the Akiyoshi Limestone Group, Southwest Japan
Fumio Kobayashi
Author Affiliations +
Abstract

Late Early Carboniferous (late Visean) to late Middle Permian (Capitanian) foraminifers have been recovered from limestone blocks and fragments contained in the Tsunemori Formation in Yamaguchi Prefecture, Southwest Japan, which is unconformably overlain by the Upper Triassic Mine Group. An analysis of the Tsunemori fauna shows an almost identical composition with that of the Akiyoshi Limestone Group. The ages of the limestone clasts of the Tsunemori Formation nearly completely coincide with those of the strata of the Akiyoshi Limestone Group. The Akiyoshi Limestone Group is subdivided into 28 foraminiferal zones, and faunal elements corresponding to 24 of these 28 zones are recognized in limestone blocks and fragments of the Tsunemori Formation. Species from the remaining four zones (late Visean Endothyra sp. Zone, the late Moscovian Fusulinella bocki Zone, early Asselian Sphaeroschwagerina fusiformis Zone, and Bolorian Misellina dyhrenfurthi Zone) in the Akiyoshi Limestone Group have not been found in the Tsunemori Formation, whose blocks and fragments are thought to have been all derived from the ancient Akiyoshi seamount. A limestone conglomerate previously assigned to the basal conglomerate of the Mine Group should be separated from the Mine Group and instead included in the Tsunemori Formation. Twelve species of foraminifers are systematically described.

© by the Palaeontological Society of Japan
Fumio Kobayashi "Late Paleozoic Foraminifers from Limestone Blocks and Fragments of the Permian Tsunemori Formation and Their Connection to the Akiyoshi Limestone Group, Southwest Japan," Paleontological Research 16(3), 219-243, (1 September 2012). https://doi.org/10.2517/1342-8144-16.3.219
Received: 27 April 2011; Accepted: 1 March 2012; Published: 1 September 2012
JOURNAL ARTICLE
25 PAGES


Share
SHARE
KEYWORDS
Akiyoshi Limestone Group
Early Carboniferous to Middle Permian
foraminifers
limestone blocks and fragments
Tsunemori Formation
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top