Trace fossils in middle to late triassic fluvial redbeds, pranhita‐godavari valley, south India
作者:
Soumen Sarkar,
AsruK. Chaudhuri,
期刊:
Ichnos
(Taylor Available online 1992)
卷期:
Volume 2,
issue 1
页码: 7-19
ISSN:1042-0940
年代: 1992
DOI:10.1080/10420949209380071
出版商: Taylor & Francis Group
关键词: trace fossil;fluvial sequence;redbed;Triassic
数据来源: Taylor
摘要:
Several morphological varieties of trace fossils abound in Middle and Late Triassic fluvial redbeds in the Pranhita‐Godavari Valley, south India, includingSkolithos, Palaeophycus, Taenidium, escape burrows, and a type of trace very similar to ‘small stuffed burrows’ from the Triassic of Greenland. Burrow morphology was influenced by local hydrodynamic conditions. The distribution of burrows was facies controlled; some forms are restricted to channel deposits whereas others occur only in floodplains. Vertical dwelling burrows(Skolithos)occur in both channel and floodplain deposits. Horizontal structures representing deposit feeding(Taenidium)are confined to nondepositional surfaces within parallel‐laminated sandstones having parting lineations that represent catastrophically emplaced sand‐sheets in channels and proximal floodplains. Vertical escape burrows are confined to what were slowly but continually accreting parallel‐laminated sands of channel bars. Horizontal dwelling burrows(Palaeophycus)and ‘small stuffed burrows’ are virtually restricted to the smaller sandsheets of floodplain drainage systems.
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