-202- Section 26 contd. of green chert, siliceous cement . . . . . . 2 11. Siltstone, yellow weathering, 1/2 inch diameter pebbles common, some bands of pebble conglomerates, poorly cemented . . . . 15 Gaptank Formation 10. Limestone, light gray weathering, nodular, uneven bedding, 3 to 6 inch beds, coll. 26-10A (3 feet above base), Triticites ventricosus (immature); coll. 26-10B (15 feet above base) T. ventricosus (im- mature) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 9. Sandstone, green-gray and yellow, very fine quartz sand, poorly cemented, well sorted, fine 1/16 inch laminations, many worm? castings, 1 to 3 inch beds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 8. Covered . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 7. Dolostone, yellow-brown weathering, 1 to 3 foot beds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6. Covered . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5. Limestone, gray weathering near base, upper portion a gray-brown weathering dolostone, 2 inch to 4 foot beds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 4. Covered . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Thickness (feet)