div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imagea href=https:reader042vdocumentsnetreader042viewer20220221195e090093974d8f017422fe3fhtml5page1jpg target=_blank img data-url=pubsusgsgov-dr-ni-middle-and-lower-devonian-rocks-predominantly-shale-hamiltonhtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: pubsusgsgov · Dr-ni Middle and Lower Devonian rocks Predominantly shale Hamilton Group in upper part and shale limestone and sandstone in lower part Silurian rocks undivided loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentsnetreader042viewer20220221195e090093974d8f017422fe3fhtml5thumbnails1jpg width=140 height=200 adivdiv