Mixed Siliciclastic/Carbonate Systems - Trace Fossils as Indicators of Sedimentary Environments - page 787

FIGURE 2 Trace fossils in the Virgin Limestone Member of the Moenkopi Formation (Early
Triassic), Nevada andUtah, USA. (A) Asteriacites lumbricalis on the sole of a sandy stormbed, lower
shoreface, Ute, Nevada. Coin ¼ 1.8 cm in diameter. (B) Bedding-plane view of branching Thalassi-
noides within a bioclastic packstone bed, proximal offshore, Beaver DamMountains, Utah. The bur-
row fill comprises disarticulated and loosely packed ossicles of the crinoid Holocrinus smithi . Pen ¼
1.3 cm in diameter. (C) Rhizocorallium within amalgamated hummocky cross-stratified sandstone,
lower shoreface, Ute, Nevada. (D) Bedding-plane view of branching Thalassinoides within a bivalve
wackestone, proximal offshore, Lost Cabin Spring, Nevada. The burrow fill consists of densely
packed bioclastic debris. (E) Firmground horizon with sharp-walled Thalassinoides penetrating
the underlying bivalve-wackestone storm bed, offshore transition, Ute, Nevada. The burrow was
passively filled with bioclastic debris from overlying bed. Pen ¼ 15 cm long.