1863.] DE GROOT DUTCH EAST INDIES. 515 



the Pliocene *. The nodular limestone he regarded as forming, with 

 some underlying beds, the Middle Tertiary series f; whilst the Plant- 

 bearing shales, still lower down, are of Eocene age, and overlie the 



Section of the Tertiary and Cretaceous Rocks of Jamaica. 



Hippurite Limestone. Eocene 



Miocene. Pliocene. 



a. White Limestone. b. Nodular Orbitoidal Limestone. 



Cretaceous Hippurite-limestone, containing Nerinosa, Actazonella, 

 Radiolites, Barrettia, Inoceramus, Ventriculites, and Orbitoides. The 

 last-mentioned limestone, with its flint-nodules and intercalated 

 shales, as well as the underlying porphyries and conglomerates, were 

 described by Mr. Barrett in the Quart. Journ. Geol. Soc. vol. xvi. 

 p. 324 J. 



It may be remarked as a point of interest, that the Nummulinas 

 and Orbitoides above alluded to are such as are found in the South 

 of Europe and in India; whilst in the neighbouring continent of 

 America Nummulince are, it seems, wanting ; and the Orbitoides (in 

 Alabama §) is 0. Mantelli, which occurs also in Scinde, but is not 

 dominant there. — [T. It. J.] 



3. Notes on the Mineralogy and Geology of Borneo and the adja- 

 cent Islands. By Mijnheer Corn, de Groot, Chief of the Mining 

 Department in the Dutch East Indies. 



(Extracted from a letter to Sir R. I. Murchison, K.C.B., F.G.S.) 



The steam-coal formation of Borneo underlies the Nummulitic Lime- 

 stone, and, so far as I am at present able to judge, belongs to the 

 " Etage Suessonien " of D'Orbigny. From the Nummulitic Lime- 

 stone the following fossils have been obtained, namely, Nummulina 

 depressa, N. lenticularis, N. mantilla, and N. polygyrata ; also Eu- 

 patangus ornatus and Phaculina Faujasii. The last-named fossil is, 



* In Mr. Woodward's paper above referred to, this limestone is termed 

 " Miocene." 



t In the Western Hemisphere, Orbitoides and Nummulina are very rare in 

 beds above the Eocene group. 



% The woodcut at p. 325 incorrectly represents the shales and limestone-bands 

 as unconformable. 



§ See Lyell on the so-called Nummulitic formation of Alabama, Quart. Journ. 

 Geol. Soc. vol. ii. p. 409, and vol. iv. p. 11 ; and Manual Elem. Geol. 5th edit, 

 p. 233. 



