Latitude & Longitude (WGS84):	43° 49' 10'' North , 69° 39' 49'' West
Latitude & Longitude (decimal):	43.81956,-69.66364
GeoHash:	G#: dry3qc07r
Köppen climate type:	Dfb : Warm-summer humid continental climate

According to the United States Census Bureau, the town has a total area of 23.16 square miles (59.98 km2), of which, 5.38 square miles (13.93 km2) is land and 17.78 square miles (46.05 km2) is water. Southport is on Southport Island in the mouth of the Sheepscot River.

On the island of Southport, on the shore near the south entrance of Townsend Gut, the schist, granite, and pegmatite are both distinctly intrusive, the schist contacts being everywhere sharp and in many places very ragged. The main mass of the intrusion is granite of normal texture, but the narrower branches sent off by the granite parallel to the foliation of the schists become typical pegmatite a short distance from the granite mass. The gradation between the two rocks is gradual and complete.

Under the microscope the granite shows an interlocking granular texture and consists principally of quartz and microcline, with minor amounts of orthoclase, of biotite altering to chlorite, and of muscovite, in part primary and in part a product of feldspar alteration. Micrographic granite is present in small amounts, as are scattered small grains of oligoclase. The minerals of the pegmatite are identical with those of the granite but occur in much larger crystals… Oligoclase and micrographic intergrowths of quartz and feldspar are also more abundant in the pegmatite than in the granite.


No minerals currently recorded for this locality.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Ordovician - Neoproterozoic 443.8 - 1000 Ma ID: 2914205

Ordovician - Precambrian Z Cape Elizabeth Formation Age: Neoproterozoic to Ordovician (443.8 - 1000 Ma) Stratigraphic Name: Cape Elizabeth Formation Comments: Divisible into lower member of black to dark-gray, thinly laminated carbonate shale and minor feldspathic quartzite, 2,000 m thick and upper member of gray, thinly laminated shale and siltstone, 600 m thick. Underlies Albee Formation. Used in ME and NH as far east as 70 deg 45' at east edge of Cupsuptic quad; Dead River Formation is eastward equivalent of Aziscohos and Albee Formations. Age is Early Ordovician. (ME041) Lithology: Major:{slate}, Minor:{schist,quartzite}, Incidental:{phyllite} Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References