The Cazadero 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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27° on Nov. 12, 1985, the coldest reading for this week of the year since 1895. Next is 29° in 1987.
Cazadero’s center stands about 200 ft above sea level. Within three miles the land runs from 170 ft to 1,890 ft, a difference of 1,720 ft: steep hill country. The highest named summit within 15 miles is Big Mountain, about 2,640 ft, 13 miles north-northwest.
The section below crosses 8 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.
Melange. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 7 mi of the line.
Sandstone, mudstone. Age: Late Cretaceous to Pliocene, 2.6 to 100 million years old. About 5 mi of the line.
Greenstone. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 2 mi of the line.
Mica-schist. Age: Early Cretaceous, 110 to 143 million years old. About 1 mi of the line.
Diorite, gabbro. Age: Triassic to Cretaceous, 66 to 252 million years old. About 0.8 mi of the line.
Serpentinite. Age: Middle Jurassic to Late Jurassic, 145 to 175 million years old. About 0.8 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 2 smaller units along the line are not listed.
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.
A raindrop that lands in Cazadero reaches the Pacific Ocean by way of Saint Elmo Creek, Austin Creek and the Russian: about 14 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Cazadero; river miles along the main stem, rounded.
Cazadero has a warm-summer Mediterranean climate. Summer afternoons average 67° in August; winter nights fall to about 42° in January. About 39 inches of rain fall in a normal year.
On November 14 Cazadero normally reaches 61° and falls to 44°. The record high is 73°, in 1990; the record low 30°, in 1985. The most rain on this date, 2.10 in, fell in 1972.
Normals 1991–2020 and records since 1895 at Fort Ross, 9 miles west. NOAA, through RCC-ACIS.
