HILL : GEOLOGY OF JAMAICA. 153 



Orbitoides, etc., of the Montpelier and lower beds are entirely absent. To 

 this formation belongs the collection of specimens described ^ by William 

 Hill from Mile Gully, Manchester Parish, containing Amphistegina. 



Probably this is the limestone largely composed of Heterosteginaj 

 from Clarendon Parish, described by T. Rupert Jones, ^ which he says 

 " corresponds to the same horizon as that of the shells and corals 

 [Bowden] brought to England by Mr. L. Barrett and lately described 

 by Mr. J. Carrick Moore and Dr. Duncan." 



Bagg reports as follows upon the Foraminifera of limestones collected 

 from the Cobre formation. 



No. 80. Yallahs : Glohigerina bulloides, d'Orb. ; Cretaceous to Recent. 

 Orbulina universa, d'Orb. 



The apparent absence of Glohigerina cretacea makes it very probable 

 that the rock is to be placed somewhere in the Tertiary period, but 

 Glohigerina hulloides occurs abundantly in many horizons. 



No. 5d>. Rock Quarry, one mile east of Spanish Town : Amphistegina, 

 (also at Bowden); Nodosaria ; Glohigerina; Text idaria trockus (also set 

 Bowden) ; Textularia (2 sp.) ; Rotalia or Discorbina. 



No. 62. Retreat, Clarendon, Operculina (T) ; Textularia (also at 

 Bowden) ; Cuneolina (f) (also at Bowden) ; Gypsina (also at Bowden). 



No species of corals have as yet been identified with certainty from 

 the Cobre limestone beds. Only two or three imperfect specimens of 

 what were apparently simple corals were found in our close examination 

 of hundreds of outcrops of this formation, but they were too imperfect 

 for specific identification. They resemble very much the simple forms 

 of the Bowden beds. 



Duncan has reported three species from *'the hard white limestone " 

 which may have come either from the Cobre formation or the white 

 limestones of the Coastal Series. One of these, Alveopora dcedalcea is 

 known to occur in formations of later age than the Bowden beds, in 

 Antigua ; another, Gyphastrcea costata, a doubtful species, is said to 

 occur in the Post-Pliocene (presumably Pleistocene) beds of the island 

 of Barbuda.* The third, Astroccenia decaphylla, he says, is a Cretaceous 



1 Quart. Jour. GeoL Soc. London, 1891, Vol. XLVIL pp. 248, 249. 



2 Op. cit., pp. 104, 105. 



3 " Ci/phastrcea costata, Duncan. The type from Barbuda is a piece of the small 

 caliced West Indian Orbicella — O. aeropom Linn. (Gregory) 0. annularis, Dana, of 

 Pleistocene, late Tertiary or recent age. The other specimen, from Santo Domingo, 

 and labelled Gyphastrcea costata, is a Solenasti-o;a, therefore the name Cyphastrc^a 

 costata must be dropped from coral nomenclature. Gregory's Cyphastraa costata 

 are Oi-bicella acropora." — Vaughan. 



