BY FREDERICK CHAPMAN. 751 



No.91. — " Chips from seatSo in Amil, Pinalum Point, on E, 

 Coast, Maleknla (not in situ)."^'' 



91a. — Macroscopic characters : a hard, yellowish, gritty- 

 looking limestone of fine-grained texture. 



Microscopic details : in thin sections this is seen to he an 

 impure limestone of organic origin, containing abundant foiamini- 

 fera, a few fragments of a slender, branching Lithothamnium, 

 some polyzoa, and lamellibranch shells, together with a fair 

 amount of angular quartz and a few scattered particles of horn- 

 blende and a chloritic mineral. A coarsely crystalline calcitic 

 cement surrounds the rock-constituents, and the whole texture 

 is granular. The Foraminifera are excellently preserved, and 

 include — 



Glooigerina buUoides d'Orb.; rare. 



G. conglobata Brady^ common. 



1 Pullenia ohliqiiilocuJata P. & J.; frequent. 



Sj^hcer'oidina dehiscens P. tfe J.; frequent. (PI. xli., fig. 14). 



Truncatulina cf. ungeriana d'Orb. sp. 



Pidvinulina '? reparida F. & M. sp.; rare. 



Amphistegina lessonii d'Orb.; common. 



Heterostegina sp. 



91b. — Macroscopic characters: a compact yellow to ash- 

 coloured limestone, containing numerous lighter-coloured streaks 

 and patches, chiefly the remains of calcareous plants. 



Microscopic contents : under the microscope this rock is seen 

 to consist largely of the sea-weed Halimeda. Foraminifera, 

 echinoid fragments, and polyzoa are also present, the whole 

 being cemented by a clear crystalline deposit of calcite. The 

 Foraminifera noticed are : — 



MilioHna sp. 



Sigmdilina sp. 



Orhitolites complanata Lnmarck. 



* Mawson, op. cit. p. 4 16, where they are classed as Miocene. 



