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Nos. 3, 4 and 5 form a perpendicular wall or bluff. The pebbles are often converted into conglomerate by .an iron cement. The fall of the river here is about 11^ feet in the distance of COO yards, being merely rapids over whose rocks a person can walk dry shod in time of low water. It is a fine place to collect fresh water shells (Unios and others) affording a great variety. On the east side of the Hidalgo Falls we had a good example of a modern deposit of sand and small gravel, which, when in durated, would show rocks dipping at largo angles, alternating with those in horizontal layers, but all deposited by river cur rents at different stages of the waters.
There was a slope at the bottom of three or four feet .to the water's edge, it being then low water. The section extended several rods along the river, and may have been washed away by the next freshet, or other deposits may have been added to it, and it may remain permanent until hardened and cemented into rock. In going up and dawn the Mississippi river during times of freshets, we have seen sand banks partly washed away, which, if indurated, would show contorted rocks or strata dipping at various angles, all formed by eddies and little whirlpools in the river. .
At depths of from 10 to 40 feet throughout a large portion of the east part of Washington county, in sinking wells, a whitish sandstone or silicious limestone is struck, containing fossil bones
-so. 3. Loose fine sand, reddish and sometimes yellow- ish, composed of crystalline grains of quartz and lime, - - tfo. 4. Variegated reddish and grey loam somewhat indurated, - . - - -
21 feet. 6 feet.
S[o. 5. Grey sandy soil and subsoil,
5 feet.
