Paleoecological and paleoenvironmental information decorded from hard substrates ichnofacies

从硬基质地层相中提取的古生态和古环境信息

• 批准号: 17540440
• 负责人: SUZUKI Akihiko
• 金额: $ 0.7万
• 依托单位: Hokkaido University of Education
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17540440/
• 关键词: Hard substrate; Paleoecology; Paleoenvironment; Trace fossil; Bioerosion

Rock-boring trace fossils are characterized by boring organisms such as bivalves, gastropods, brachiopods, barnacles, polychaete annelids, sponges, bryozoans, etc. In general, these trace fossils are used as indicators of ancient rocky shores, and are useful for reconstruction of pal eoenvironments.The shallow-marine facies of Hokkaido rich in rock-boring bivalves was deposited during the Miocene. I studied rock-boring bivalves and their clavate borings at two localities in northern Hokkaido. In locality Akebono, basal part of the Sankebetsu Formation unconformably overlies the basement and is composed of fine-grained sandstone. Rock-boring bivalves such as Penitella kotakae and Platyodon nipponica are recognized, and the clavate boring of Penitella, Gastrochaenolites turbinatus, dominated in the basements. This occurrence represent autochthonous, and is presumed to wave-cut bench of ancient rocky shore. In locality Yamato, basal part of the Yamato Formation unconformably overlies the basement and is composed of basal conglomerate. Boring bivalves dominated in clasts of conglomerates, and no occurrence on the basements. Rock-boring bivalves, P sp., and their clavate borings, G. turbinatus, dominated in the clasts. This occurrence represent semi-autochthonous, and is presumed to boulder beach of ancient rocky shore.The paleoecological characteristics of the molluscan and ichnofossil assembleges in these localities reflect changes in the sedimentary environment during a sea-level transgression. The rocky shores were formed during the transgression events in the Miocene time. Bioerosion on marine rocky surfaces demonstrates to be a very good tool to reveal geological episodes such as relative oscillations of the sea-level, erosion/sedimentation rates and intensity of physical disturbance.

钻岩遗迹化石以双壳类、腹足类、腕足类、藤壶类、多毛类环节动物、海绵类、苔藓虫类等钻岩生物为特征。这些遗迹化石通常被用作古岩岸的指示物，并可用于古环境的重建。富含钻岩双壳类的北海道浅海相沉积于中新世。我在北方北海道的两个地方研究了钻岩双壳类和它们的棍棒状钻孔。在Akebono地区，Sankebetsu组的基底部分不整合地覆盖在基底上，由细粒砂岩组成。钻岩的双壳类，如Penitella kotakae和Platyodon nipponica被确认，Penitella，Gastrochaenchaenburbinatus的棍棒状钻孔，主要在地下室。该产状代表原地产状，推测为古岩质海岸的浪蚀阶地。在Yamato地区，Yamato组的底部不整合地覆盖在基底上，由基底砾岩组成。砾岩碎屑中以双壳类为主，基底中未见双壳类。钻岩双壳类，P sp.，和它们的棒状钻孔，G. turbinatus，在碎屑中占主导地位。该产状为半原地产状，推测为古岩质海岸的漂石海滩。岩岸是在中新世海侵事件中形成的。海洋岩石表面上的生物侵蚀被证明是揭示地质事件的一个非常好的工具，例如海平面的相对振荡、侵蚀/沉积速率和物理扰动的强度。

项目成果

A fossil Tridacna (Bivalvia : Tridacnidae) from the Pleistocene Ryukyu Limestone of Okinawa Island, Southwestern Japan

日本西南部冲绳岛更新世琉球石灰岩中的砗磲化石（双壳纲：砗磲科）

• 发表时间: 2006
• 期刊: Chiribotan Vol.36
• 作者: Suzuki;A.
• 通讯作者: A.

北海道望来海岸の打ち上げ貝類とその生態学的意義

北海道茂木海岸搁浅的贝类及其生态意义

• 发表时间: 2005
• 期刊: 環境教育研究 8
• 作者: 鈴木明彦;疋田吉識;鈴木明彦
• 通讯作者: 鈴木明彦

Miocene Pectinidae from the Onishika Formation developed in Obira Town of Northern Hokkaido

北海道北部小平町大西组发育的中新世扇贝科

• 期刊: Bulletin of the Historical Museum of Hokkaido No.34
• 作者: Akamatsu;M.;Hikida;Y.;Suzuki;A.;Sagayama.;T.;Soeda;Y.;Koshitaka;D.;Hiranaka;N.;Nojo;A.;Togo;Y.
• 通讯作者: Y.

徳島県鳴門市へのオウムガイの漂着

鹦鹉螺号搁浅于德岛县鸣门市

• 发表时间: 2006
• 期刊: 漂着物学会誌 4
• 作者: SUZUKI;A.;HIRANAKA;N.;HIKIDA;Y.;鈴木明彦;鈴木明彦
• 通讯作者: 鈴木明彦

Introduction to the study of ancient rocky shores

古代岩石海岸研究简介

• 发表时间: 2006
• 期刊: Earth Science Vol.60
• 作者: Suzuki;A.
• 通讯作者: A.