TESTS OF PHILIPPINK ROAD MATERIALS. 



457 



Rock varieties. 



Basalt . 



Do„_ 



Do — 



Andesite. 



Do_.-, 



Do 



Do .__, 

 Do___. 



Gabbro . 



Textures. 



Dense 



Vesicular and sco- 



riaceous. 



Dense 



Vesicular 



Crystalline 



do 



do_ 



Vesicular 



Crystalline, but 



weathered. 

 Dense, fine grained. 



Brecciated 



Gravel, crystalline. 

 do 



Do 



Diorite 



Diorite and andesite. 



Diorite ' Crystalline 



Limestone | Dense 



Do I do 



Do Porous 



Do Dense 



Do Porous 



Do j Dense 



Do '. Dense, argillaceous- 



Localities. 



Nuni- Per- 

 berof ceiit- 

 sam- , age of i 

 pies. ' wear. 



Talim Island, Manila city quarry_^ 

 do 1 



Road from Antipolo to Tay tay, Rizal. 

 do 



Los Banos quarry, Laguna 



Sisiraan quarry, Bataan 



Arayat quarry, Pangasinan 



do 



Sea beach below Batangas, used in 



road from Batangas to San Juan. 

 New Manila city quarry, Angono, 



Rizal. 

 Old Spanish quarry, Angono, Rizal. 



Benguetroad 



do 



Sara-Ajuy road, Iloilo 



Montalban, Rizal 



Sibul Springs, Bulacan 



San Esteban, IlocosSiir 



Danar, llocos Sur 



San Fernando, La Union 



Benguet road 



do . 



2.57 

 8.66 



2.61 

 4.60 

 2.66 

 4.0.S 

 2.62 

 3.54 

 3.79 



2.31 

 1.98 

 2.67 

 1.76 

 3.97 

 3.77 

 4.55 

 3.67 

 5. 73 

 4.34 

 6.09 



atone used for the streets of Manila. — During the Spanish regime very 

 few streets of Manila were macadamized^ and tliese only imiDerfectlv. 

 The streets which were well improved were, for the most part, paved 

 with granite blocks imported from Hongkong as ballast. In addition, 

 ])aving blocks were cut from an andesite near the present Sisiman quarry, 

 which is situated near Mariveles at the entrance to Manila Bay. Also 

 at several places near Angono, Binangonan and Talim Island, basaltic 

 and gabbroic paving blocks were made in a desultory way. Samples of 

 these classes of block pavements can be seen in Manila to-day, and the 

 mode of wear of the paving blocks is a fair index to the quality of the 

 stone for macadam. At the beginning of the impirovement of the streets 

 by the American authorities, some crushed stone was obtained from the 

 Binangonan quarry. This quarry has a very limited face, the stone varies 

 in te.xture, and, accordingly, is unsuitable for large operations and was 

 soon abandoned. The next place where quarrying was carried on exten- 

 sively was on Malagi Island Just southeast of Talim Island. The estab- 

 lishing of quarries there came about through using the island as a 

 prison and'the effort to employ the convicts at manual labor. The stone 

 was not of superior quality and when the island was abandoned as a 



