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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Fish otoliths from the subsurface Cambay Shale (Lower Eocene), Suratlignite field, Gujarat (India)
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Fish otoliths from the subsurface Cambay Shale (Lower Eocene), Suratlignite field, Gujarat (India)

机译：印度古吉拉特邦苏拉特轻石田Cambay页岩（下始新世）地下的鱼耳石

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Here we report on a small assemblage of teleost fish otoliths (ear-bones) recovered from borehole clays obtained from the lignite field at Tarkeshwar, Surat district, Gujarat (Figure 1). Prior to this find, the only known occurrences of Tertiary otoliths in the Indian subcontinent were those from the Middle Eocene Harudi Formation of Kachchh and the Drazinda Shale (Khirthar Formation) of Pakistan. The present find represents the oldest Cenozoic record of otoliths from India, adding an important component to the poorly known Lower Eocene vertebrate faunas. The Middle Eocene vertebrates from India, on the contrary, are fairly well-documented (especially from the Harudi Formation of Kachchh and the Subathu Formation of Himalaya). The lignite field in the Surat-Broach area extends from the village Valia (Broach district) in the north to Tarkeshwar (Surat district) in the south. In the latter district, the lignite-bearing area falls within the latitudes 21 deg 22 min 35 sec N and 21 deg 26 min 35 sec N and the longitudes 73 deg 04 sec 00 sec E and 73 deg 07 sec 35 sec E. It is located 29 km ENE of Kim and about 60 km NW of Surat by road. The otolith-bearing samples of dark-grey clays were kindly provided to one of us (B.S.) by the Mineral Exploration Circle, Ahmedabad. These samples, recovered from the depths 182.65-183.55 m (Sample no. MLDS/1) and 206.25-209.30 m (Sample no. MLDS/5), occur both above and below the lignite levels (Figure 1 b). Stratigraphically, the otolith-bearing horizons form part of the Cambay Shale which occurs above the Deccan Traps and associated laterites/lithomarge (Vagadkhol Formation) and is, in turn, overlain by the Upper Eocene nummulitic limestones and marls (Amravati Formation). The Middle Eocene Ankleshwar Formation is notably absent in the area. Palynological investigations of lignites and associated clays indicate an Early Eocene age for the otolith-bearing levels (Samant, unpublished data).
机译：在这里，我们报告了从古吉拉特邦苏拉特地区塔克什瓦尔的褐煤田获得的钻孔黏土中回收的硬骨鱼耳石（耳骨）的小组合（图1）。在此发现之前，在印度次大陆上唯一已知的第三级耳石是来自Kachchh的中始新世Harudi组和巴基斯坦的Drazinda页岩（Khirthar组）的。目前的发现代表了印度耳石的最古老的新生代记录，为鲜为人知的下始新世脊椎动物群增加了重要组成部分。相反，来自印度的中始新世脊椎动物则有据可查（特别是来自卡奇奇的哈鲁迪组和喜马拉雅山的苏巴图组）。 Surat-Broach地区的褐煤田从北部的Valia村（Broach区）延伸到南部的Tarkeshwar（Surat区）。在后一个地区，褐煤轴承区域位于北纬21度22分35秒和北纬21度26分35秒和经度73度04秒00秒E和73度07秒35秒E内。距金恩（ENE）金29公里，距素叻（Surat）西北部约60公里。深灰色粘土中含有耳石的样本由艾哈迈达巴德的矿产勘探圈提供给我们中的一个（BS。）。这些样品是从褐煤水平之上和之下（图1b）从182.65-183.55 m（样品编号MLDS / 1）和206.25-209.30 m（样品编号MLDS / 5）中回收的。在地层学上，含耳石的地层构成了坎贝页岩的一部分，该地层位于Deccan圈闭及相关的红土/锂砾岩（Vagadkhol地层）之上，并依次被上新世统陶统石灰岩和泥灰岩（Amravati地层）覆盖。该地区明显缺少中始新世的Ankleshwar组。对褐煤和相关粘土的孢粉学研究表明，含耳石的水平为始新世早期（Samant，未公开数据）。

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