hill: geology of Jamaica. 121 



In 18G3 the material collected by Barrett and mentioned by Wood- 

 ward, was reported upon by T. Kuj^ert Jones. ^ Orbitoides are included 

 in the list of Cretaceous fossils given by Etheridge,^ and alleged to occur 

 with Nerinaea and Rudistes by Woodward,^ and Duncan and Wall* 



Woodward ® reported both Orbitoides and Nummulinae from the 

 " Hippurite limestone " of Jamaica, which '' is unlike that of any Eng- 

 lish stratum. It abounds in small oval bodies related to the Tertiary 

 Nummulites, and also contained liadiolites, Inocerami, a large Nerinsea, 

 and an Actseonella resembling A. Icevis d'Orb.'^ We have not person- 

 ally observed Orbitoides in the Jamaican Cretaceous rocks, although 

 they abound in the Eocene, as will be shown on a later page. Creta- 

 ceous limestones from Costa Rica, described in our Panama Report, 

 show a mixture of remains very suggestive of the one described. The 

 occurrence of Orbitoides and iSIummulites, which abound in the Eocene 

 formation, is more fully discussed on later pages. 



Duncan asserted ^ that the corals were mostly European forms, " the 

 majority have very decided facies, . . . suggestive of a close alliance 

 of the great coral fauna of Gosau in the Eastern Alps," while others 

 were alleged to be " common forms in the Kriedensmerle." He also 

 stated"^ that "there is a community of species of corals between the 

 Lower Chalk of Gosau and Piesting and the French Hippurite lime- 

 stone at Martigues, the Corbieres, and Uchaux. ... It is clearly this 

 assemblage of forms which is represented in Jamaica ; and it is an in- 

 teresting fact that the specimens from Gosau, Mount Hindmost, and 

 Trout Hall present the same mineral aspect; in fact, the specimens 

 are barely to be distinguished." Vaughan, who has recently re-examined 

 Duncan's collections, does not agree with his conclusions, and states that 

 they have no affinities with the Gosau forms. The Gosau (Cretaceous) 

 forms are Senonian, and do not belong to the lower horizon to which 

 Duncan referred them. Furthermore, two of the species mentioned by 

 Duncan from Trout Hall and Upper Clarendon, Diploria crassolamel- 

 losa, Duncan (non Edwards and Haime) = Diploria conferticostata^ 

 Vaughan, and Ileliastroea exsculpta, Duncan (nou Reuss) = Multicolum- 



1 Quart. Joiir. Geol. Soc. London, 1863, Vol. XIX. p. 514. 



2 Jamaican Reports, p. 310. 



8 "Tlie Geologist," Vol. V. p. 373. 



4 Quart. Jour. Geol. Soc. London, 1865, Vol. XXL p. 2. 



6 s. P. Woodward, in the Geologist, London, 1862, Vol. V. p. 373. 



6 Quart. Jour. Geol. Soc. London, 1865, Vol. XXI. p. 11. 



7 Ibid., p. 12. 



