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V. S. Parihar

Discovery of Lockeia gigantus trace fossils in India - P 148-153

The present study discovered the well-preserved
Lockeia gigantus traces from the Fort Member of the
Jaisalmer Formation of the Jaisalmer Basin in the
Jethwai area of Jaisalmer district, western Rajasthan,
India. Here, the L. gigantus traces have been recorded
in the yellowish medium- to fine-grained silty sandstone
in the Jethwai section. The L. gigantus trace fossils are
large-sized (ranging from 35 to 70 mm), elongated,
seeds-shaped to almond-shaped in smooth surface
traces, preserved as convex (positive) hyporeliefs with
more or less tapered at both ends. These species of the
Lockeia genus are interpreted as the resting traces
probably of Plicatounio bivalves, however, these Plicatounio bivalves have not been recognized yet from the
Fort Member of the Jaisalmer Formation. These new
L. gigantus resting traces represent the largest ever
known Lockeia specimens and are the first time reported in India.

Subjects--Facted Index Terms:
Fort member
Jaisalmer Basin
Jaisalmer Formation
Lockeia gigantus
Plicatounio bivalves
resting traces
western Rajasthan.