604 PROCEEDINGS OF THE ACADEMY OF [NoV,, 



If incoherent or soft fossiliferous beds could be found in Antigua, 

 such as occur in Santo Domingo or on the Isthmus of Panama and 

 in Costa Rica, the fauna obtainable from this Antigua limestone 

 would undoubtedly be a large one. I examined the island carefully 

 for such deposits^ but none of this soft character were met with. Fur- 

 ther research may disclose such deposits, but unfortunately the tuffs 

 in which they might be found have undergone much compression 

 and they are too much altered, where they have, thus far, been found 

 to carry fossils, to give much hope of finding them fossiliferous and 

 at the same time soft. The limestone is sometimes in the form of a 

 soft marl, but even this has usually undergone alteration and the 

 fossils have been subjected to crystallization which has obliterated 

 many characters. In some cases the organic remains have been 

 dissolved and replaced by silica, or the shells have been dissolved 

 away leaving a cast of the cavity, but no mould to show the exterior 

 of the organism. The most favorable place for collecting specimens 

 to represent the fauna that was seen was the region of Willoughby 

 Bay, and from what I saw there it is evident that the fauna is a very 

 large one. 



That the igneous activity continued during the Oligocene, after 

 the deposit of these limestones, is indicated by the occurrence at 

 Crosbies of a dyke of dark andesite which has been injected into the 

 white marl and has altered it in places, the dyke itself being also 

 altered. This dyke is 15 feet wide or more, and is compact and not 

 porous. This locality at Crosbies is near the northern shore and 

 about a mile to the southwest of Hodge's Bay. Purves mentions 

 this locality, but places it on the seashore. Angular lapilli of volcanic 

 ash were found in the limestone at Hodge's Bay, indicating volcanic 

 action at this time. 



5. Hodge's Hill Calcareous Sandstone (of Spencei?). 



Professor Spencer has given this name to a calcite sandstone 

 composed of water-worn grains of coral, shell, and other calcareous 

 matter, found at Hodge's Hill in the northeastern corner of the 

 island. These beds are seen along the shore at Hodge's Bay over- 

 lying the hard Antigua limestone, and resting upon them with a very 

 fiat dip. Spencer regards this contact as unconformable, but there 

 seems to be no erosion unconformity, and the difference in dip is 

 very slight. The material has a very different appearance (as 

 regards compactness, for example) from the harder Antigua limestone 

 which it overlies, but I have no doubt that it is really a part of the 



