File:The Quarterly journal of the Geological Society of London (12645858835).jpg

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,