Photo shows Tropic shale at Muddy Brook 6 miles above its mouth, in Kane County, Utah, in 1939. Photograph from Herbert E. Gregory Book 11: Colorado Plateau, 1938-194
Photo shows Straight Cliffs sandstone, capped by basalt, at the head of Oak Creek, Washington County...
Photo shows the Shnabkaib member (left) and upper red beds of Moenkopi formation at Taylor Creek in ...
Photo shows Straight Cliff sandstone (top), Tropic Dakota and Winsor formation (in middle and foregr...
Photo shows Tropic shale at Muddy Brook 6 miles above its mouth, in Kane County, Utah, in 1939. Pho...
Photo shows Tropic shale in Muddy Brook Valley west of Orderville, Kane County, Utah, 1932. Photogra...
Photo shows alluvial terraces lying unevenly on Tropic shale, in Parunuweap Valley between Ordervill...
Photo shows upper beds of the Tropic formation near the head of Deep Creek in Washington County, Uta...
Photo shows Straight Cliffs sandstone overlying Tropic shale, as viewed from the back of the school ...
Photo shows meadow land along upper Kolob Creek, developed in Tropic shale, in Washington County, Ut...
Photo of Cretaceous shales (Tropic formation) in Antimony Canyon, Garfield County, Utah, in 1943. Ph...
Photo shows alluvial terraces made since 1900, at Johnson Creek, Kane County, Utah, in 1939. Photog...
Photo shows Tropic shale (Cretaceous) at the head of La Verkin Canyon. Washington County, Utah, 1937...
Photo shows a coal outcrop in the Dakota or basal Tropic, on east side of Meadow Brook. Kane County,...
Photo shows Cretaceous (above Tropic shale) capped by Wasatch of Paunsaugunt Plateau near head of De...
Photo shows Gypsum in Curtis formation near Highway 89 crossing of Muddy Brook, Kane County, Utah, i...
Photo shows Straight Cliffs sandstone, capped by basalt, at the head of Oak Creek, Washington County...
Photo shows the Shnabkaib member (left) and upper red beds of Moenkopi formation at Taylor Creek in ...
Photo shows Straight Cliff sandstone (top), Tropic Dakota and Winsor formation (in middle and foregr...
Photo shows Tropic shale at Muddy Brook 6 miles above its mouth, in Kane County, Utah, in 1939. Pho...
Photo shows Tropic shale in Muddy Brook Valley west of Orderville, Kane County, Utah, 1932. Photogra...
Photo shows alluvial terraces lying unevenly on Tropic shale, in Parunuweap Valley between Ordervill...
Photo shows upper beds of the Tropic formation near the head of Deep Creek in Washington County, Uta...
Photo shows Straight Cliffs sandstone overlying Tropic shale, as viewed from the back of the school ...
Photo shows meadow land along upper Kolob Creek, developed in Tropic shale, in Washington County, Ut...
Photo of Cretaceous shales (Tropic formation) in Antimony Canyon, Garfield County, Utah, in 1943. Ph...
Photo shows alluvial terraces made since 1900, at Johnson Creek, Kane County, Utah, in 1939. Photog...
Photo shows Tropic shale (Cretaceous) at the head of La Verkin Canyon. Washington County, Utah, 1937...
Photo shows a coal outcrop in the Dakota or basal Tropic, on east side of Meadow Brook. Kane County,...
Photo shows Cretaceous (above Tropic shale) capped by Wasatch of Paunsaugunt Plateau near head of De...
Photo shows Gypsum in Curtis formation near Highway 89 crossing of Muddy Brook, Kane County, Utah, i...
Photo shows Straight Cliffs sandstone, capped by basalt, at the head of Oak Creek, Washington County...
Photo shows the Shnabkaib member (left) and upper red beds of Moenkopi formation at Taylor Creek in ...
Photo shows Straight Cliff sandstone (top), Tropic Dakota and Winsor formation (in middle and foregr...