Poster Number 100
See more from this Division: General Discipline Sessions
See more from this Session: Paleontology (Posters) IV - Stratigraphy and Morphology
Abstract:
Detailed location and identification of approximately 60 outcrop and subcrop exposures were measured with a sub-meter GPS and the data were downloaded into a GIS. The unexpected results showed that within the serpentinite, the limestone facies occur in a repeating stratigraphic sequence. The sequence begins with mudstone, followed by fossiliferous limestone, with increasing cement toward the top. Concretions occur on the lateral margins of the limestone. These sequences correlate throughout the mapping area and strike in a northeast to southwest direction.
Published geologic maps of Wilbur Springs depict the faulted limestone outcrop within a serpentinite diapir. Comparing the limestone exposure to the current geologic map reveals anomalies in the lithologic distribution. The limestone is not as widespread as shown on the map though the serpentinite contains small, meter-scale pockets of cement-rich and rare fossiliferous limestone.
A closer look at the distribution of ancient hydrocarbon seep deposit byproducts is needed to correctly interpret this important and fragile environment.
See more from this Division: General Discipline Sessions
See more from this Session: Paleontology (Posters) IV - Stratigraphy and Morphology