The Philippine journal of science . ed by large phenocrysts of almost colorless plagio-clase. These were the only good rock exposures to be „ ^seen on the Laguna de Bay slope, but there is little doubt 5 -that this entire section consists of andesitic and basaltic °igneous rocks and volcanic tufE. A general geologic sec-tion of the route is shown in fig. 1. a A few lumj)s of coal which had been collected and left J by Lieutenant Wray a few days before were observed at ° the Macadata Eiver. Lieutenant Wray, acting underorders from department headquarters, examined some coal that were
The Philippine journal of science . ed by large phenocrysts of almost colorless plagio-clase. These were the only good rock exposures to be „ ^seen on the Laguna de Bay slope, but there is little doubt 5 -that this entire section consists of andesitic and basaltic °igneous rocks and volcanic tufE. A general geologic sec-tion of the route is shown in fig. 1. a A few lumj)s of coal which had been collected and left J by Lieutenant Wray a few days before were observed at ° the Macadata Eiver. Lieutenant Wray, acting underorders from department headquarters, examined some coal that were known to occur near the headwaters of theMacadata. They were found to be of doubtful economic J ; value, although very little prospecting work was at- o ^ tempted. -^ ^ No coal outcrops, quartz ledges, or bowlders of mineralized quartz wereobserved on this journey. K ILLUSTRATIONS. Plate I. Route map, Infanta to Tanay. Fig. 1. (In text.) General geologic section, Infanta to Tanay. 489 o /< ? H •Z < ?i -f --57-— o.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1906
