. Annual report of the Board of Regents of the Smithsonian Institution . e the Pisco formation displays approximatelyten distinct terraces rising to a height of perhaps 1,000 feet. Along Top of /tin on•3/SOfi. A/orCfi sicfe of Oco/fo ff/ror of /ta rnoutff \ Terraoe cui in^^esooff. Igneous rocft \ Terrace e \^- laooft. ov^eeti ¥^it/f rivt 9r i>ouidmrm <i=,o3i ^^^^^iS^ort . \ YeJ/ovvc/ay andso/rd-storfaT\ rrfUt aomg So u/der^ ^******^ «tA i^veu Fig. 10.—Section sbowiug: marine cut terraces at the moutli of the Ocofia River. the southern part of the Peruvian coast in front of the range of c
. Annual report of the Board of Regents of the Smithsonian Institution . e the Pisco formation displays approximatelyten distinct terraces rising to a height of perhaps 1,000 feet. Along Top of /tin on•3/SOfi. A/orCfi sicfe of Oco/fo ff/ror of /ta rnoutff \ Terraoe cui in^^esooff. Igneous rocft \ Terrace e \^- laooft. ov^eeti ¥^it/f rivt 9r i>ouidmrm <i=,o3i ^^^^^iS^ort . \ YeJ/ovvc/ay andso/rd-storfaT\ rrfUt aomg So u/der^ ^******^ «tA i^veu Fig. 10.—Section sbowiug: marine cut terraces at the moutli of the Ocofia River. the southern part of the Peruvian coast in front of the range of coasthills where the rivers have cut their canyons through, there are ter-races in the igneous rocks which constitute the hills and also in theremnants of what were once delta formations of these streams. Theterraces at the mouth of the Ocoila River, as seen by the writer andmeasured with an aneroid, are represented in the following sketch(fig. 10). The upj)er terrace at Ocoiia is the highest one which wasfound on the coast. Terr oca cut in igrieous roe/^ Fig. 11.—Section showing marine cut terraces at the mouth of the Ilo River. (Compare fig. 8.) Tlie railroad station, Tambo near Mollendo, on the Southern Rail-way, has an elevation of 1,000 feet and is situated on the north side ofthe River Tambo near its mouth, on an extensive terrace which musthave attracted the attention of many travelers, although its origin isnot explained in any scientific article which has come to the writersnotice. The terraces south of the Ilo River, near its mouth, are indicated inthe above sketch (fig. 11). 422 ANNUAL KEPOET SMITHSONIAN INSTITUTION, 1908. Q. ^ Incidentally it may be said that at themonth of the canyon just north of Pisaguain Chile similar terraces may be seen, theupper one being at an elevation of some-thing more than 1,000 feet. These terraces, taken together with theelevation at which the Pliocene Tertiaryformations on the coast are found, recordthe rising of the l
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