Maryland Geological Survey 99 



lated with the llaiuiltou beds of Xew York. Hall and other paleon- 

 tologists have identified collections of fossils from these rocks in northern 

 West Virginia and from intermediate localities between that state and 

 New York as composed of Hamilton species. If the various geological 

 maps, reports, and papers describing the Devonian formations from West 

 Virginia to New York are put together and considered it will be found 

 that this correlation is strongly supported by visible continuity. Further- 

 more the Ftratigraphic jiosition of these beds strongly supports this 

 correlation. 



The paleontologieal data is much more exltnsive regarding the Hamil- 

 ton beds than it is as yet for the Marcellus shale. The table of distribution 

 gives the list of species recorded by the writer from tlie Hamilton beds of 

 Maryland and their range in the New York formations. The total number 

 of species is 147 of which 21 are limited to Marylaiul leaving 126 identical 

 or closely related species which also occur in Xew York. An enumeration 

 of the totals for the New York Devonian formations shows that 3 identical 

 species occur in the Helderbergian series; 1 identical in the Oriskany; 6 

 identical in the Schoharie; 17 identical, doubtfully 4 more, and 2 affili- 

 ated occur in the Onondaga ; 47 identical. 1 more doubtfullv. and 7 

 affiliated in the Marcellus ; 92 identical and 32 affiliated in the Hamilton; 

 2 identical in the Tully; 4 identical and 1 affiliated in the Genesee; 2 

 identical in the Portage; 4 identical and 2 affiliated in the Naples; 10 

 identical and 1 affiliated in the Sherburne ; 55 identical. 2 more doubt- 

 fully, and 9 affiliated in the Ithaca, and 18 identical. 4 more doubtfully, 

 and 3 affiliated in the Chemung. Adding these numbers, the total number 

 of entries for each New Yoik formation is as follows: Helderbergian 

 series 3, Oriskany sandstone 1, Schoharie grit 6, Onondaga limestone 23, 

 ]\rarcellus shale 55, Hamilton beds 124, Tully limestone 2, Genesee shale 

 5. Portage beds 2, Naples beds 6, Sherburne sandstone 11. Ithaca beds 

 GO. and the Chemung lieds 25. Judging from tlie number of entries it is 

 then seen that the Maryland beds show the closest relationship witii the 

 Onondaga, Marcellus, Hamilton. Ithaca, and Chemung formations of 

 New York; and especially with the Marcellus. Hamilton, and Ithaca. 

 On examining the total number of entries foi' these three formations it is 



