Environmental Engineering Reference
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A
B
Ch
Th
Th
Te
Pl
10 cm
1 cm
D
1 cm
1 cm
Zo
Te
Ch
Pl
Ch+Zo+Te
Te
C
Ch
Ch+Zo+Te+Th
1 cm
E
FIGURE 6
Rocks and ichnofabrics representing the
Zoophycos
Ichnofacies in rhythmically bed-
ded, epeiric basin chalks, marls, and calcareous shales of the Turonian-Campanian Niobrara Forma-
tion, U.S. Western Interior (
Savrda, 1998a
). (A) Decimeter-scale rhythmic alternation of lighter
chalk (limestone), moderately carbonaceous gray marl (marlstone), and dark carbonaceous calcar-
eous shale manifested in core. Variations in carbonate and organic contents, as well as ichnofabrics,
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