Today we looked at a different set of rocks in the eastern side of the Chiang Mai basin. At our first stop, we determined the depositional environment of the unit by observing sandstone and shale. One layer of sandstone was more weathered than another layer of sandstone based on the amount of decaying feldspar, and sandstone had thick beddings of 1.5 to 2 meters. Also, there were cross laminations in the shale which suggests the presence of a current. Next we observed that the alternating sandstone and shale deposits were signs of changing sea levels (low and high water levels). One thing that I found interesting at this stop was the “touch-me-not” plant or “mimosa pudica.” Dr. Brady and Jasmin explained to me that this sensitive plant would fold up its leaves as a form of protection when touched. Then the leaves would reopen a few minutes later. You can see this plant and catch a glimpse of the observed rock unit in the video below.
Posted on: Sun, 06 Jul 2014 09:07:34 +0000
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