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rROCEEDIXGS OK THE ACADEMY OF [DeC. 



December 3. 

 The President, Samuel G. Dixox, M.D. , in the Chair. 



Ten persons present. 



A paper entitled " A ]Sew Species of Ophibolus,'' by Arthur 

 Erwin Brown, was presented for publication. 



The death of Herman Strecker, a member, was announced. 



Lodel Creek and Skippack Creek. — Mr. Benjamin Smith 

 Lyman remarked that on October 26, 1901, the Mineralogical 

 and Geological Section of the Academy of Natural Sciences made 

 an excursion to Fisher's quarry, some twenty yards south of Lodel 

 creek (on the U. S. Geological Sui'vey's topographical sheet incor- 

 rectly called Landis brook, which is really the name of the next 

 stream to the north). The quarry is near a small highway bridge, 

 one mile northwest of Grater's ford, on the Perkiomen railroad. 

 The rockbeds of the quarry belong to the American New Red, 

 and, as observed in 1889, at the time of the State Geological Sur- 

 vey, show the following section from above downwards: 



Dark red, rather soft shales, about 5 feet. 



Dark dull red, rather hard, thin-leaved shales, with fossil 

 impressions and calcai'eous seams, about 4 " 



In all, about 9 " 



The shales are close withiu the upper limit of the beds marked on 

 the State Geological map of Bucks and Montgomery counties as 

 the Lausdale shales. They dip here 13° N. 30^° W. (true 

 bearing). 



The excursion party was so fortunate as to find a large slab of 

 the stone of irregular shape, about five feet long by three feet wide 

 and perhaps five inches thick, that proved to be particularly rich 

 in interestinir impressions. The whole of one side was covered 

 with unusually perfect ripple marks, of about three-quarters of 

 an inch in amplitude. In spite of the rij)ples, somewhat indistinct 

 traces of two Dinosaur tracks, with three forward-pointing toes, 

 could be discerned, each track about six inches iu extreme length 

 and about thi'ee inches in width. The two tracks are in line, and 

 about twenty inches apart, centre to centre, evidently formed by 



