670. From the turn of the river east of the Rock House the ark rises miraculously down stream. Since Stephenson near plane convexa also mays- villeners, between 10 and 12 feet above river. Orthoryn- clema stones. || Then the ark dips gently toward the Rock House or that the Step-plemene led comes down to water level at the Rock House. Refines grain is cream 7 feet above the steppe venea hinge at Rock House, 21 feet from River at Rock Hne. to top of orthorynchala beca? fine in which hyrps are me abundants above this level there are arg. beds inter bedded in what might be called the transversal mac beds. West from the Rock House as far as The bend in the river the rocks are essenti- ally derigenous, here the river turns south. A rather thin fed bed here fine limestone on sides down the creek form a clear coal creek.