Labels:text | diagram | sketch | map OCR: PLATE 5 67 . 15' 67 . 00 45' 30 66 . 00 45' 65 . 30" 18 30 18 30 1 N D ---- IN 800000 000000 + 15' O' 15' 4 10 .. ....... 9 Lines are boundaries determined by visual inspection. 18 00 Hachures point in direction of rock masses with lower magnetizations. + Dots are boundaries calculated by computer. 18 00 . Maximum Horizontal Gradient 222 (mGal/km) 0.18 - 0.48 . D 0.48 - 1.10 o 1.10 - 6.06 4 . Numbers refer to features discussed in the text. Occurrence of porphyry-copper mineralization. Taken from Plate See text for description of calculation method. 67 '15' 30' 00 . 29 Scale 1:200,000 15' 86 . 00 65 . 30 MAGNETIC BOUNDARY MAP OF PUERTO RICO By Andrew Griscom and Nami E. Kitchen
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