Environmental Engineering Reference
In-Depth Information
FIGURE 10
Trace fossils in levee deposits of the Late Cretaceous Nanaimo Group, Gulf Islands,
British Columbia. (A) Thin-bedded turbidites with wavy parallel laminae. Beds show BI
¼
0-2, with
isolated trace fossils such as
Thalassinoides
(
Th
),
Scolicia
(
Sc
), and
Ophiomorpha rudis
(
Or
).
(B) Turbidite bed with well-developed convolute bedding at its top. Unit shows BI
¼
0-1, with iso-
lated fugichnia (fu),
Ophiomorpha rudis
(
Or
), and
Planolites
(
P
). (C) Thin-bedded levee turbidites,
with the lower unit showing well-developed current ripples and the upper sandstone characterized
by loading into underlying mudstone. The mudstone is unburrowed. The sandstones contain isolated
fugichnia (fu) and
Scolicia
(
Sc
). The silty turbidite caps contain
Planolites
(
P
),
Palaeophycus tubu-
laris
(
Pt
), and
Phycosiphon
(
Ph
). (D) Thin- to thick-bedded turbidites with
Asterosoma
(
As
) (prob-
ably allochthonous),
Thalassinoides
(
Th
), and
Phycosiphon
(
Ph
). (E) Well-developed Bouma
T
b-e
turbidite containing aggradational current ripples. The unit shows BI
¼
2, with isolated fugichnia
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