Print this pageFacies and Architecture of the
Chimney Rock Member,
An outcrop study, a core well drilled through the outcrop,
and well logs along the northern margin of the Rock Springs Uplift of
southwestern 
wave
-dominated shoreface,
with the overlying medial parts of the section consisting of incised-valley
deposits (wave-dominated estuarine and tidal deposits). These two sections of
the Chimney Rock Member are separated by a significant erosion surface, a
sequence boundary
that marks a relative fall in sea-level. The upper reaches of
the Chimney Rock Member consist of a mixed strandplain
and coastal plain succession. A throughgoing flooding
surface and transgressive lag (likely TSE) separates
the incised valley fill from the overlying mixed strandplain
and coastal plain deposits.