590 



PROCEEDINGS OF THE ACADEMY OF 



[Nov. 



age of the white limestone or Antigua formation, although he 

 records having visited "a marl pit about 2 miles from St. John's" 

 with Mr. W. R. Forrest (doubtless the one on Marble Hill, which 

 I visited twice, once in company with Mr. Forrest) in which he found 

 casts of Pholadomya and also of Turritella. Upon my visit to this 

 locality in company with Mr. Forrest, we were not so fortunate, 

 finding only the small, badly preserved branching corals, common 

 in the marl everywhere, but Mr. Forrest remarked to me that Turri- 

 tellas were sometimes found here as casts, and also casts of bivalves. 

 The preservation of the fossils in these soft marls is very imperfect, 

 and secondary crystallization obscures the structure. They are 

 rarely determinable specifically. The major part of Mr. Guppy's 

 paper is taken up in discussing the "Great Dislocation," of which, 

 during my stay upon the island, I did not see any evidence; nor has 

 its presence been detected by Mr. R. W. Forrest, who has given 

 much attention to the geology of the island. 



The general succession of the formations in Antigua has been 

 discussed by Nugent, Purves, and Spencer, and a brief review of their 

 several arrangements of the strata has been given above and their 

 correlations indicated. From my own observations, a slightly differ- 

 ent arrangement has been deduced, as follows: 



Table of the Geological Formation of Antigua. 



