230 W. M. Fontaine—Mesozoie Strata of Virginia. 
far under the Tertiary. The lithology and stratigraphy pre- 1 
sent many remarkable features, only a few of which can b 
noticed. The thickness of the strata and coarseness of the 
Not more than fifty or sixty feet of strata appear in the banks 
of the stream here, but from the manner in which the bluffs 
descend beneath the water, and the depth of the latter, the 
total thickness near Dutch Gap cannot be less than one hundr 
and fifty feet, while near Richmond it is not more than fifty or 
sixty feet. The variableness of the material, and the com- 
plexity of the rapidly shifting planes of false-bedding are so 
great, that no two sections taken a few feet apart will be similar; 
a e 7 
together, and looking much like a section of the cobble-paved 
streets of Richmond. 
