588 PROCEEDINGS OF THE ACADEMY OF [NoV., 



organic remains, and that of a very general kind, only the genus 

 being noted in many cases. A short list of corals from the lower 

 marine chert and limestone, C, is given, however, which will be 

 referred to later in this paper. 



Some reference to the movements of elevation and subsidence of 

 Antigua is given in a paper by Dr. J. W. Gregory, "On the Palaeon- 

 tology and Physical Geology of the West Indies, "" and a few additions 

 to the palseontology of Antigua are there noted. 



The next paper to be published dealing with the geology of Antigua 

 is by Professor J. W. W. Spencer, "On the Geological and Physical 

 Development of Antigua"^ which appeared in 1901. This gives a 

 revision of the formations of the island, as follows, the basal member 

 being placed at the bottom: 



8. Recent deposits, raised beaches. 



7. Cassada Garden gravels. 



6. Friars Hill series, pebbles and marl. 



5. Hodge's Hill calcareous sandstones. 



4. White limestone or Antigua formation. 



3. Tuffs and included marls and chert. 



2. Seaforth limestone. 



1. Igneous basement. 



Comparing this with the divisions as recognized by Purves, given 

 above, the first division, 1, corresponds to his A; that is, the "igneous 

 basement" of Spencer is the "porphyrites and volcanic agglomerates" 

 of Purves. Spencer's Seaforth limestone does not seem to have been 

 recognized by Purves, although it doubtless exists near Seaforth; 

 and I was shown specimens from this horizon by several collectors, 

 said to have come from the base of the stratified tuffs. Spencer's 

 No. 3, "Tuffs and included marls and chert," includes divisions 

 B, C, D, E, and F of Purves, these formations occupying the "Central 

 Plain" of Antigua. Purves's division G, upper limestones and marls, 

 is the same as Spencer's No. 4, "White limestone or Antigua forma- 

 tion," and may also include his division 5, Hodge's Hill calcareous 

 sandstone. Spencer's divisions 6 and 7, "Friars Hill series" and 

 "Cassada Garden gravels," were not recognized by Purves; while 

 his division 8 is the same as the "horizontal marl" of Purves. Upon 

 the whole, this division of the formations recognized by Spencer 

 agrees with the observations which I was able to make while on the 

 island better than do those of Purves or Nugent, although in each 



6 Quart. Jour. Geol. Soc. London, LI, 1895, p. 295. 



^ Quart. Jour. Geol. Soc. London, LVII (1901), pp. 490-505. 



