(7) 19.0 Chalkstone, friable fq-vfq, chiefly massive but with laminar clayey sand and thin-bedded zones. OB stain on surface and in layers. A heavily stained OB layer, crumbly, '2.05 from top of interval. Local indurated SS ledges and large "calcite" type concretions, in interval, irregularly distributed. (8) 3.0-? Obscure zone at top of bluff. Gray shale, plant fossils, silty to grass roots where locally accumulations of oysters. Some OB stain. (Sample). A647 Distance from the top of unit (1) down to the Juvosite zone at top of the Timberlake equivalent not known exactly. The Juvosite does not crop out in the amphitheatre, but does locally over the west end on south side south rim - where T.L. cones also sparsely present. Here it is about 28 feet from top of Juvosite to zone of sand concretions at top of unit #1. 4