Thursday, July 23, 2015

More on the lahar

The "lahar" has been mapped as a lava flow, but it's so unconsolidated that I wonder whether it might not be pyroclastic, or at least of low viscosity. See Figure 1 in

Hazlett, Richard W. (1987). Geology of the San Cristobal Volcanic Complex, Nicaragua. Journal of Volcanology and Geothermal Research 33: 223-230.

I have heard rumors of an archaeological site on the south side of San Cristobal that has mounds partly buried under a lava flow. The edge of this flow would presumably be the best place to look for it. So, we went back to drive up the east side of the flow last Sunday. We saw some interesting stratigraphy in stream cuts, but no sites.

Oh, well. Maybe next time. I'm convinced that if you look around enough, and know what you're looking for, you'll eventually discover something interesting.

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