April 10. Friday Allentown - Slatington Set off at 5.30. Started in to see the Ordovician section higher than that seen yesterday. In the abrand and quarry of the old iron furnaces are seen li, some about 43 foot high with at [but about 18] least 10 prominent zones of Cryptogon. They are always here a white [magnesian] in fites limestone, in laminated layers and conglomerated. The lateral extent is very wide across the quarry face. Between these are many which are dolitic. darker and usually thicker magnesian layers, There is a great Cement Industry near the top of the Mohawkian beneath the Martins- nery between Asplay and Cementon. Now the Mohawkian is in a low rounded fold anticlinal which a horzontal schistosity has been developed almost to the extent of slate cleavage. This they material that they use for cement. I saw no fossils. The Martinsburg shale here a slate lies in a distinctly higher county than the lome- stone belt. It is 2 miles to the Blue Out, the