Malott: The "American Bottoms'' Region 



47 



its downward descent came upon a ''nose" of the bed-rock 

 ridge, but kept its position, and cut a gorge at that point in 

 the Cypress sandstone (see Fig. 4). 



' Fig. 4. Post-lUiiioiaii streaiii-gurge in the soullK'ast ( oniei- of section 

 27, wliere tlie stream from tlie iiortli passed over a portion of tlie buried 

 part of tlie ridge at the side of the pre-ghieial yalley. IMioto.^raph by P. F>. 

 Stoclvdale. 



We have ah-eady seen that the ''American Bottoms" is 

 a filled valley, due to the spreading of an outwash apron 

 which obstructed the lower part of the valley completely. 



