-153- Top of Hill Leonard Formation Thickness (feet) 12. Limestone, light gray to light tan weathering, lower 6 to 10 feet have large limestone cobbles and small amounts fine chert pebbles, this unit is largely replaced by dolomite coll.9-12 58 11. Covered 27 10. Shale, siltstone, and very fine grained sandstone, light brown weathering, friable 17 9. Calcarenite, dark gray weathering, some black chert pebbles, organic fragmental for most part, coll. 9-9 1 1/2 8. Covered, probably light brown shale, and siltstone 25 7. Calcarenite, medium gray to orange-brown weathering, a few small pebbles near base, upper 1 to 2 inches siliceous 2 6. Covered, probably mostly light brown shales and siltstones 7 5. Limestone, brown-gray weathering, biohermal 3 inch to 2 foot beds, large crinoid columnals 3 1/2 4. Shale and siltstone, light brown, friable 1