Major Depositional Characteristics
Mississippian siliceous sponge-microbe communities
- low relief biostromes and bioherms surrounded by mudstone
- accumulation of sponge spicule-rich wacke-packstones
Conditions favorable for accumulation may have been created in response to basement block movement
T-R cycles on a shelf to shelf margin setting resulted in a series of shallowing cycles
- Ranging upward from sponge spicule-poor argillaceous mudstone to sponge spicule rich wacke-packstones which were overlain by bioclastic wacke-grainstone shelf deposits and terminated by an exposure surface
Sponge spicule content may increase upwards with increasing cycle thickness
Soon after burial these were silicified