Brent Watson; Age of "basal Mesozoic" redbeds in north-central Texas. AAPG Bulletin ; 48 (10): 1726–1727. doi:
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Abundant charophyte gyrogonites, identified as Atopochara trivolvis, Peck, 1938, indicate that the so-called "basal Mesozoic beds" should henceforth be considered Lower Cretaceous in age.
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