Vol. 56.] AEOLIAN SANDS OF KATHTAWAK. 5S7 



thin deposit of a dark colour. The foraminifera are numerous, 

 comprising Truncatulina, Pulvinulina, Rotalia, and Amphistegina. 

 Associated with these are numerous rounded pellets (? excretionary), 

 molluscan shell-fragments, a small gasteropod-shell, and eehinoderm- 

 plates. 



V, 279 0. Chorwar Road, nearly 10 miles from the sea. 

 — A cavernous, semicrystalline limestone,, having the walls of the 

 cavities stained with ochreous "matter. This is a more coarsely 

 crystalline development of the preceding rock, and differs in the 

 larger proportion of material derived from molluscan shells. Some- 

 what flaky fragments of these form the majority of the included 

 particles of this rock. There are also present hone-fragments 

 and echinoderm-plates and spines. Foraminifera are exceedingly 

 rare, and represented only by Amphistegina. The matrix appears to 

 be clear granular calcite, and constitutes perhaps 50 per cent, of 

 the bulk of the rock. (See PI. XXXII, fig. 1.) 



YI, Porbandar Calcareous Rock. — This is one of those rocks 

 especially referred to by Carter as coming from Kathiawar, and 

 used for building-stone. The present specimen was given to Prof. 

 Rupert Jones by the late Henry Hailes in 1886. It is a white 

 calcareous rock, interspersed with red particles. The rock itself is 

 homogeneous in character, and when two pieces are struck together 

 they sound with a distinct, musical ' clink.' Thin sections of this 

 rock seen under the microscope are of a yellowish colour, and suggest 

 partial phosphatization. They show a very evenly granular struc- 

 ture, the granules being cemented in a clear crystalline calcitic 

 matrix. The granules consist of foraminifera, gasteropod and 

 lamellibranch shell - fragments, echinoderm-plates and spines, 

 coprolitic (?) granules, oolitic grains, and some fragments of Litho- 

 thamnion. The foraminifera belong chiefly to the genera Miliolina, 

 Pulvinulina, and Rotalia. The granules are all neatly rounded, or 

 when elongate, rounded at the extremities, and they are all invested 

 with a thin dark layer which seems to be the first stage towards an 

 oolitic structure. (See PI. XXXII, fig. 2.) 



Postscript. 



Since writing the foregoing notes I have received an interesting- 

 paper from Mr. E. H. L. Schwarz, entitled 'Notes on the 

 Recent Limestones on Parts of the South & West Coasts of Cape 

 Colony ' by him and A. W. Rogers. 1 It deals with some coastal 

 deposits formed as sand-dunes, showing false-bedding, and with 

 included marine shells, land-shells, and mammalian bones. The 

 upper portions of these deposits are hardened by the percolation 

 of surface-water, which dissolves and redeposits the carbonate of 

 lime. This occurrence seems to throw additional light on the mode 



1 Trans. S. Afric. Phil. Soc. vol. x (1898) pp. 427-36 & pi. x. 



