55 There is another range of volcanic cones a considerable distance to the east of these in the same old Mono basin
In accounting for that circling bank of vol [volcanic] sand, the second period of activity may be entirely left out If the [more] solid part of the cone should fall in or sink perpendicularly the ring would be produced provided the cone had remained a sufficient length of time to accumulate the debris of which it is composed the cone did positively subside after it had remained stationery a considerable length of time as is proved by the worn abraded surfaces meeting with comparatively fresh ones & by the presence of warn sand & pebbles with fresh sharp edged chips & splinters.
According to this theory then we have not a crater within a crater but an ill-defined fragmentary crater sunk perpendicularly to a level with its own well defined undisturbed base
Original journal dimensions: 10 x 16.5 cm.
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