538 CHARLES S. PROS SEE 



to the Marcellus shales, and Corniferous limestones of the 

 New York Geological Reports." It is evident that No. 3 of 

 Mather's section included both the Sandusky and Columbus 

 limestones of Dr. Newberry's later classification, as Newberry 

 stated in his section of the "State House Well," where he called 

 No. 3 the "Corniferous limestone,' and which later he divided 

 into the Sandusky and Columbus limestones.'' 



Mather's article was simply a report to the state house com- 

 missioners, and the terrane is very imperfectly defined. Since it 

 has never been recognized in geological literature, while the 

 Columbus limestone of Newberry is a well-known formation, it 

 is not considered necessary to recognize Mather's name, and 

 therefore Newberry's name of "Columbus limestone" is retained 

 for this formation. 



19. In the Ohio reports this mass of limestone, with some 

 included beds of gypsum and sandstone, has frequently been 

 termed "the Lower Helderberg or Waterlime formation." 3 The 

 Lower Helderberg, however, represents now the Helderbergian 

 series of the New York classification, while the Waterlime belongs 

 in the next older series, the Cayugan. There are in New York, 

 however, according to Mr. Schuchert, two divisions of the Wat- 

 erlime — the lower, named the Bertie, and the upper, the Rond- 

 out, which are separated by the Cobleskill (Coralline) limestone.-^ 



The correlation of the Ohio formation with those of New 

 York is indefinite, and it appears advisable to adopt the name 

 applied by Dr. Lane to these rocks in southeastern Michigan. 

 The name " Monroe beds " first appeared in a " Geological 

 Column " prepared by Dr. Lane and incorporated in a report of 

 Dr. Wadsworth published in 1893.^ In this publication the for- 

 mation was not defined; but in 1895 it was fully described by 

 Dr. Lane and shown to include all the rocks between the Niagara 



^'Repi. Geol. Surv. Ohio, Vol. I, Part I (1873), p. 1 14. 



""Ibid., p. 143. ''See Vol. VII, pp. 4, 14. 



'^ Ai?i. Geol., Vol. XXXI (March, 1903), pp. 160, footnote, and 169-78. 



•i Rept. State Board Geol. Surv. for i8gi and 1892, p. 66. Dr. Wadsworth states 

 in a letter to Dr. Lane that " the late winter or early spring of 1893 was the date of 

 publication." 



