Transcription of TEXAS ROCKS & FOSSILS
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TEXAS ROCKS & FOSSILS
3567891213141516171819323536373839404142 4344454647484950525354555657656364665868 596062806921272920 TEXAS Department of Transportation1. Abundant in many TEXAS localities, fossil seashells are found in avariety of settings, from blackland prairies to rocky hillsides. Indi-vidual specimens like these are usually from the Cretaceous pe-riod of some 100 million years ago. They may be actual fossilspecimens, molds as shown in number 23, or casts like the heartcockle pictured here. Fossil snails, scallops, whelks, tusk shellsand corals are also commonly found. Pictured FOSSILS from 3/4inch to 7 inches; all Central These fossilized marine pelecypods are sprinkled with shinyspecks of marcasite, a mineral chemically identical to iron Pennsylvanian FOSSILS in limestone dating from the Paleozoicera some 300 million years ago. McCulloch Track of a theropod dinosaur from Dinosaur Valley State Parknear Glen Rose in North Central TEXAS . The site contains a hostof tracks made from some 100 million years ago in limey mud,now turned to Replica of the 12-foot-high, 50-foot-long Tyrannosaurus Rex,whose tracks are preserved in stone in Dinosaur Valley StatePark (see number 4).
ence is that jasper is virtually opaque while agate is translucent to nearly transparent. West Texas and the length of the Rio Grande. 42. Graphite ore in schist rocks. As are diamonds, graphite is pure carbon, but is extremely soft, black, and slippery feeling. Its best known use is, of course, as the writing medium in ordinary “lead”
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