The Anchor Bay plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.
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Anchor Bay’s center stands about 110 ft above sea level. Within three miles the land runs from 0 ft to 1,340 ft, a difference of 1,340 ft: steep hill country. Open water lies within three miles. The highest named summit within 15 miles is Buck Peak, about 2,680 ft, 12 miles north-northeast.
Under the town center the state geologic map shows Upper Cretaceous marine rocks, unit 1 (Upper Great Valley Sequence) (sandstone, siltstone-mudstone), from the Late Cretaceous, 66 to 100 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 9×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone, mudstone. Age: Late Cretaceous to Pliocene, 2.6 to 100 million years old. About 7 mi of the line.
Mudstone, sandstone. Age: Paleocene to Oligocene, 23 to 66 million years old. About 3 mi of the line.
Sandstone, mudstone. Age: Paleocene to Middle Eocene, 38 to 66 million years old. About 1 mi of the line.
Sandstone, siltstone-mudstone. Age: Late Cretaceous, 66 to 100 million years old. About 0.7 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.
Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
Rain that falls on Anchor Bay runs straight into the Pacific Ocean.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Anchor Bay; river miles along the main stem, rounded.
