. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 128 bulletin: museum of comparative zoology. tion of man's occupation of the area for a few centuries perhaps in the past. Pissis (1875, p. 78-81) has described the distribution of the most recent marine elevated deposits of Chile. Beginning on the north in the plain which extends from the Bay of Antofogasta to that of >s-<= fO^ 100 ioo loo "00 Sue too 700 soo »C9 loco hqo noo Fig. 35.— Rise to the north of the Recent uplifted marine deposits of Chile, according to the data of Pissis (1875, p. 78-81
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 128 bulletin: museum of comparative zoology. tion of man's occupation of the area for a few centuries perhaps in the past. Pissis (1875, p. 78-81) has described the distribution of the most recent marine elevated deposits of Chile. Beginning on the north in the plain which extends from the Bay of Antofogasta to that of >s-<= fO^ 100 ioo loo "00 Sue too 700 soo »C9 loco hqo noo Fig. 35.— Rise to the north of the Recent uplifted marine deposits of Chile, according to the data of Pissis (1875, p. 78-81). The dotted line apparent warped surface from Oaldera .southward. The line a-b gives the mean tilt-rate from Mejilloncs southward. The line c-d is drawn at the same tilt-rate to touch the elevated rock bench at Corral. Mejillones this plain, having there an altitude of forty meters, is represented by correlated deposits at constantly lower levels oh the south as far as the 38th parallel. In the vicinity of Caldcra the deposits rise from twenty-five to thirty meters above sea-level. About Valparaiso and San Antonio the level is maintained between fifteen and twenty meters. The city of Concepcion is built on the sands at the mouth of the Rio Bio Bio and finally at Levau the de- posits rise scarcely two to three meters abo\e the sands of the beach. Taking these data as given b\^ Pissis and plotting the upper limit between Mejillones and Levau, the tilt-rate is shown by the graphical construction in Fig. 35. According to these observations made by Pissis as early as 1875 the coast from a point north of Valdivia shows a rise at the rate of about ft. per mile for about 1,100 English statute miles. Valdi\ia and Corral lying to the south of this group of raised deposits as noted above shows evidence of depression preceding the last slight rise of the coast. Accepting Pissis's altitudes for the height of the uplifted plain and assuming the above rate of tilting, the aba
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Keywords: ., bookauthorha, bookcentury1900, bookdecade1910, booksubjectzoology
