Agate and the surrounding High Plains terrain are defined by the meandering course of the Niobrara River, which carves a distinct valley through this corner of Sioux County. This 2011 survey documents a landscape preserved for its paleontological significance, notably within the Agate Fossil Beds Natl Monument. The mapping reveals a sparse network of ranch roads such as Nunn Rd and Panhandle Rd that traverse the uplands between water sources like Dead Mans Creek. The juxtaposition of the modern road grid against the ancient geological deposits of the Agate Fossil Beds illustrates the area's dual identity as both working ranch land and a critical site for scientific study. While the small settlement of Agate remains a central point of interest, the map primarily highlights the intersection of natural drainage patterns and the historic routes, including River Rd, that follow the valley floor.
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This is the sole edition of this map. No revisions or reprints were ever made.
1899 · Whistle Creek
USGS Topo · 1:125,000
1955 · Alliance
USGS Topo · 1:250,000
1957 · Alliance
USGS Topo · 1:250,000
1958 · Alliance
USGS Topo · 1:250,000
1979 · Harrison SE
USGS Topo · 1:24,000
1979 · Mount Edna
USGS Topo · 1:24,000
1979 · Harrison SW
USGS Topo · 1:24,000
1979 · Agate SW
USGS Topo · 1:24,000
1979 · Agate NW
USGS Topo · 1:24,000
1979 · Agate
USGS Topo · 1:24,000