. Annual report of the United States Geological Survey to the Secretary of the Interior . ides of the Lampasas Cut the eastward marginal region ofthe Grand Prairie the outcrop of the for-mation descends toward the stream a consequence many of the streams incertain portions of their courses flow inwide and fertile valleys established uponthe Walnut beds, between outer bluffs ofthe Edwards limestone. Of this natureare the valleys of the Trinity in westernTarrant County, the Bosque, in BosqueCounty, the Leon, east of Gatesville, andNolands River, in southern Bell County. From

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. Annual report of the United States Geological Survey to the Secretary of the Interior . ides of the Lampasas Cut the eastward marginal region ofthe Grand Prairie the outcrop of the for-mation descends toward the stream a consequence many of the streams incertain portions of their courses flow inwide and fertile valleys established uponthe Walnut beds, between outer bluffs ofthe Edwards limestone. Of this natureare the valleys of the Trinity in westernTarrant County, the Bosque, in BosqueCounty, the Leon, east of Gatesville, andNolands River, in southern Bell County. From Wise County northward the Wal-nut formation rests upon and passes hori-zontally into the Basement (Antlers) sands,the upper part of which is no doubt theequivalent of the Walnut formation ofthe more southern sections. Between theTrinity and the Lampasas the Walnutformation rests upon the unconsolidatedPaluxy sands. South of the LampasasRiver the Walnut rests directly upon theconsolidated layers of the upper GlenRose beds. The general areal distribution of this . < ,.

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