Environmental Engineering Reference
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FIGURE 5
Substrate-controlled trace-fossil assemblages, Chase Group (Early Permian), Okla-
homa, USA. (A) Massive carbonate beds in the lower part of the Wreford Limestone showing inter-
nal molds of the burrowing infaunal mytiloid bivalve
Pinna
in life position (arrow). (B) Paired slabs
of a core showing oval to circular, Y-branching burrows of
Thalassinoides
isp. in the Barneston
Limestone. Core hole 10, Kay County. Core slabs are 6 cm wide.
After
Chaplin (1996)
. (C)
Thalas-
sinoides
isp. Distinctive Y-shaped burrow systems preserved as positive hyporeliefs on a sole of the
Wreford Limestone, Kay County.
After
Chaplin (1996)
. (D)
Rhizocorallium
isp. Long, horizontal
form interpreted as both a dwelling trace of a suspension-feeding animal and a feeding trace of a
deposit feeder.
After
Chaplin (1996)
.
(E)
Rhizocorallium
isp. Preserved as epirelief on a
bedding-plane surface. Wreford Limestone, Kay County.
After
Chaplin (1996)
.
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