Details of sandstone east of Lyons. Boulder County, Colorado. 1922.
Dates
Date Taken
1922
Summary
Details of sandstone east of Lyons, that is correlated with the upper sandstone of the Dakota group at Bellvue; showing a hard quartzose layer resting on carbonaceous shaly sandstone. The lower dark colored material is full of small fragments of charcoal and impressions of twigs and variety of plant debris. Boulder County, Colorado. 1922. Plate 31-B in U.S. Geological Survey. Professional paper 149. 1927. Plate 3-A in U.S. Geological Survey. Bulletin 751. 1925.
Summary
Details of sandstone east of Lyons, that is correlated with the upper sandstone of the Dakota group at Bellvue; showing a hard quartzose layer resting on carbonaceous shaly sandstone. The lower dark colored material is full of small fragments of charcoal and impressions of twigs and variety of plant debris. Boulder County, Colorado. 1922. Plate 31-B in U.S. Geological Survey. Professional paper 149. 1927. Plate 3-A in U.S. Geological Survey. Bulletin 751. 1925.
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