St. David Formation 
                       Introduction

Cochise College  
Geology of Southeastern Arizona      San Pedro River Valley             
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Roger Weller, geology instructor

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Climatic influences on continental deposition during
late-stage filling of an extensional basin, southeastern
Arizona
(selected portions)
by Gary A. Smith
Geological Society of America Bulletin, v.106,
p. 1212-1228, Sept. 1994

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This article describes the St. David Formation, a Cenozoic valley fill deposit in the San Pedro River Valley.