In Utah , in the Capital Reef National Park area , this layer of fossils is up to ten feet thick .
Is present in the lower Tununk section of the Mancos Shale Fraction , just above the Dakota Sandstone and below the Blue Gate Shale layer .
In Utah , in the Capital Reef National Park area , this layer of fossils is up to ten feet thick , and is present in the lower Tununk section of the Mancos Shale Fraction , just above the Dakota Sandstone and below the Blue Gate Shale layer .