. Transactions. rth Tremors Committee, which concluded that the shocks in themines of that region were entirely the result of mining operations and that they wereliable to occur after such a depth was reached that the superincumbent weight ofthe overlying rocks was sufficient to crush the pillars in the mine workings. LIMONITE DEPOSITS OF MAYAGUEZ MESA, PORTO RICO 97 Limonite Deposits of Mayaguez Mesa, Porto Rico* BY CHAS. R. FETTKE,f PH. D., PITTSBURGH, PA., AND BELA HUBBARD, NEW YORK, N. Y. (Colorado Meeting, September, 1918) During the summer of 1916, while on a visit to the United StatesAg
. Transactions. rth Tremors Committee, which concluded that the shocks in themines of that region were entirely the result of mining operations and that they wereliable to occur after such a depth was reached that the superincumbent weight ofthe overlying rocks was sufficient to crush the pillars in the mine workings. LIMONITE DEPOSITS OF MAYAGUEZ MESA, PORTO RICO 97 Limonite Deposits of Mayaguez Mesa, Porto Rico* BY CHAS. R. FETTKE,f PH. D., PITTSBURGH, PA., AND BELA HUBBARD, NEW YORK, N. Y. (Colorado Meeting, September, 1918) During the summer of 1916, while on a visit to the United StatesAgricultural Experiment Station at Mayaguez, Porto Rico, the writerswere told by D. W. May, the director, that an occurrence of manganeseore had been reported from the mesa southeast of Mayaguez. A visitto the locality showed that the mesa is covered by a mantle of bright redsoil resting upon serpentine. Here and there over its surface concre-tionary masses of limonite have been washed out of this soil. These were. Fig. 1.—Mayaguez from northwest end of mesa. apparently mistaken for manganese ore. On account of the similarityof this occurrence to the extensive iron deposits of northeastern Cuba, itwas thought that a brief description based upon a two days reconnaissancesurvey of the area would be of scientific interest. Mayaguez is on the west coast of Porto Rico, at Mayaguez Bay,which is the third in importance of the harbors of the island. The cityitself is about % mile inland on the low-lying plain at the mouth of the * Published with the permission of the New York Academy of Sciences, underwhose auspices, in its undertaking of the natural history survey of Porto Rico, thedata for this paper were gathered. t Geologist, Carnegie Institute of Technology. VOL. LXI. 7. 98 LIMONITE DEPOSITS OF MAYAGTJEZ MESA, PORTO RICO Mayaguez River. With its population of about 16,500, it ranks third insize among the cities of the island. The narrow-gage railroad of theAmerican Railroad Co. of
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