Environmental Engineering Reference
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FIGURE 11
Sand-sheet deposits. Early Cambrian Lake O'Hara Member, St. Piran Formation,
Gog Group, southern Rocky Mountains, Canada. (A) General view. (B) Cross-section view of
Sko-
lithos linearis
(
Sk
) extending down from the upper surfaces of the foresets of a planar cross-stratified
sandstone. (C) Compound cross-stratified, fine- to medium-grained sandstone showing sigmoidal-
shaped surfaces separating different cross-stratified beds. (D) and (E) Cross-section view of
Plano-
lites montanus
(
Pl
) in intercalated rippled cross-laminated sandstone and mudstone at bottomsets of
a compound cross-stratified sandstone. (F) Cross-section view of a pipe rock comprising
Skolithos
linearis
(
Sk
) and
Arenicolites
isp. (
Ar
). (G) Hummocky cross-stratified sandstone containing several
specimens of
Rosselia
isp., which extend down from the upper surface.
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