Hallopora can be commonly founded in what type of bedrock formation?
Hallopora:  They can be found in Ohio, Indiana, and Kentucky of the Midwestern United States, commonly in the Ordovician Kope Formation. Kope Formation: The Kope Formation is one of the three component bedrock formations of the Maquoketa Group that primarily consists of shale (75%) with some limestone (25%) interbedded.
Kope Formation