The Jonesport 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.
Mostly cloudy
Partly cloudy
Mostly sunny
Mostly sunny
Partly cloudy
Mostly sunny
Partly cloudy
Jonesport’s center stands barely above sea level. Within three miles the land runs from 0 ft to 190 ft, a difference of 190 ft: gently rolling country. Open water lies within three miles. The highest named summit within 15 miles is Milton Mountain, about 440 ft, 14 miles northwest.
Under the town center the state geologic map shows Devonian Eastport Formation, basalt member, from the Devonian, 359 to 422 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Mafic-volcanic, felsic-volcanic. Age: Silurian, 422 to 445 million years old. About 3 mi of the line.
Volcanic. Age: Silurian, 422 to 445 million years old. About 2 mi of the line.
Basalt. Age: Devonian, 359 to 422 million years old. About 1 mi of the line.
Felsic-volcanic, mafic-volcanic. Age: Silurian, 422 to 445 million years old. About 0.9 mi of the line.
Conglomerate. Age: Silurian to Devonian, 359 to 445 million years old. About 0.6 mi of the line.
Gabbro, diorite, ultramafic. Age: Devonian, 359 to 422 million years old. About 0.6 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit 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.
