. Bulletin. Ethnology. 286 BUREAU OF AMERICAN ETHNOLOGY [Bull. 170. Volcanic Sedimentary- Metamorphic Plutonic Figure 80.—Geologic map of southeastern Mexico. check on this likely source locality, five specimens were collected from the general region by Ing. Hugo Contreras which all proved to be pyroxene-rich olivine basalts similar to those described by Friedlaender and Sonder. Specimens E and N in the series examined by the late William F. Foshag, a list of which is appended at the end of this report, may have had their source in this region but prob- ably no others of the ones examined. The
. Bulletin. Ethnology. 286 BUREAU OF AMERICAN ETHNOLOGY [Bull. 170. Volcanic Sedimentary- Metamorphic Plutonic Figure 80.—Geologic map of southeastern Mexico. check on this likely source locality, five specimens were collected from the general region by Ing. Hugo Contreras which all proved to be pyroxene-rich olivine basalts similar to those described by Friedlaender and Sonder. Specimens E and N in the series examined by the late William F. Foshag, a list of which is appended at the end of this report, may have had their source in this region but prob- ably no others of the ones examined. The next nearest source of volcanic rocks to La Venta is at Volcan de la Union on the Mescalapa River, 125 km. southeast. Six samples collected from this locality by Ing. Hugo Contreras proved to be coarse-grained hornblende andesites containing no trace of olivine or pyroxene. Despite the lack of pyroxene, these rocks are similar in general appearance to the hornblende andesite from Monument 14 and it is possible that this monument, at least, came from there, but the source of the hornblende basalts must be Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Bureau of American Ethnology. Washington : G. P. O.
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