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Surface of ground is a layer of lava from 10-40 ft thick & above this again layers of sand gravel & pumice. [[strikethrough]] to the surface [[/strikethrough]].  The lake occupies about 2/3ds of bottom & is being filled up by the wash from the upper border but is said to be [[strikethrough]] about [[/strikethrough]] over 100 ft. deep in deepest place.  Many coots, some Podilymbus podiceps a few violet Gr. swallows, Sagonis nigricans & Rock Wrens were found in this sink.  This place is evidently [[strikethrough]] a sinke [[/strikethrough]] the result of a sinking of the ground.  A few bunches of rushes are growing about its border & the people of bordering Hda's resort to border of the lake for drinking water, to wash themselves & clothing.  Also for watering sheep.  The lake is