J@mg
MORRISON, CURTIS, ENTRADA, AND GLEN CANYON FMS
sedimentary
sandstone, mudstone, claystone,
siltstone, shale
2.1.1
mudstone
sandstone
Upper Triassic
Upper Jurassic
235
144
Curtis is absent along Grand Hogback
ABW
mudstone includes claystone, siltstone, and shale
J@
mixed seds