In north-central Texas, a generally sandy, conglomeratic, redbed sequence occurs between known Cretaceous Trinity Group sediments and eroded Pennsylvanian sediments; this sequence is usually referred to as the “basal Mesozoic beds.” Great interest in these “basal Mesozoic beds” has developed through the years because of their lithologic variation and questionable geologic age. The apparent absence of any fossil remains has precluded a reliable age determination for the sequence.

The “basal Mesozoic beds” contain five recognizable units in Parker and Hood Counties, Texas. (1) The oldest unit is a discontinuous, dark gray conglomeratic sand containing pebbles of sandstone, limestone, and chert,...

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