div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imageimg data-url=documentpubsusgsgov-trout-creek-formation-first-described-by-smith-1927-consists-ofhtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: pubsusgsgovTROUT CREEK FORMATION first described by Smith 1927 consists of gray to tan tuffaceous sandstone and siltstone and shale interstratified with white to tan diatomite loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader037fdocumentsinreader037viewer2022090610607119567d08236ea5333e4bhtml5thumbnails1jpg width=140 height=200 divdiv