When Lake Nicaragua was an ocean inlet, its track extended to foot hills northward. Its waterworn pebbles and small bowlders were subsequently covered by lake deposit, during the time between the inclosure and break out at San Carlos. In this deposit around the lake (now dry) fossil bones occur—elephas, megatherium, horse, etc. The large alluvium plains north of lake, cut through by rivers, allow these bones to settle on their rocky beds. This deposit is of greater depth in places west of lake.
Now, if we suppose these animals were exterminated in glacial times, it remains for us to show when this was consummated.
Subsequent to the lake deposit and exposure no new proofs of its continuance are found.
1. This deposit occurred after the coast range was elevated.
2. Elevation was caused by a volcanic ash eruption, 5 or 6 of a series. (Geologically demonstrated in my letters to Antiquarian and Science.)
3. Coast hills inclosed sea sediment, now rock containing fossil leaves.
4. Wash from this sediment, carried with care, formed layers of sandstone, up to ceiling.
5. This ceiling was covered with elaborate inscriptions.
6. The inscription sent you was a near neighbor to cave.
7. Another representing a saurian reptile on large granite bowlder is also a neighbor (a glacial dropping).