45 Bed Thickness No.
Storm beds with ripped up limestone fragments and shingled Inoceramus fragments are abundant.
The Vinson differs from he Atco in having thinner shale beds and greater amounts of chalk. The Vinson Member is conformable with the Atco M er below and the Jonah Member above. Environments of deposition - The Vinson Member represents environments on a broad, shallow, open, marine shelf well removed from the shoreline. The shallow water deposition, probably less than 30 meters, is attested to by many oysters and inocerami.