Trace fossils from Talchir carbonate concretions, Giridih basin, Jharkhand

被引:7
作者
Das, S. S. [1 ]
Tripathi, Mahesh Kumar [1 ]
机构
[1] Univ Allahabad, Dept Earth & Planetary Sci, Nehru Sci Ctr, Allahabad 211002, Uttar Pradesh, India
来源
JOURNAL OF EARTH SYSTEM SCIENCE | 2009年 / 118卷 / 01期
关键词
Trace fossils; Talchir Group; concretions; Giridih basin; environment; GONDWANA BASIN; INDIA; SEDIMENTS; CLASSIFICATION; PATTERNS;
D O I
10.1007/s12040-009-0009-6
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The carbonate concretions occurring at the bottom of Talchir fissile shale facies preserved signatures of various trace fossils along with a cast of doubtful organisms and cyanobacterial mat structures. The host shale deposited under glacial melt water fed lacustrine condition. The concretions, formed in poorly oxygenated conditions, are either of syndepositional origin and/or deposited a little below the sediment water interface and were later exhumed to the depositional surface due to erosion of soft mud overlying them. The trace fossils are both megascopic and microscopic in nature. The megascopic trace fossils are identified on the basis of their morphology as Monocraterion and Rhizocorallium. Some of the megascopic structures described remain problematic at present. The microscopic trace fossils are formed due to the activity of marine meiofauna (possibly by nematodes), which, although produced morphologically show similar traces of known larger ichnogeneras but much smaller than them. The discovery of these trace fossils apparently indicate the influx of saline water into a lacustrine domain during the Talchir sedimentation at Giridih basin. Moreover, presence of the above two megascopic trace fossils in the marine lacustrine carbonate concretions may lead researchers to consider their much wider environmental significance than hitherto believed.
引用
收藏
页码:89 / 100
页数:12
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