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Southern Carbonate Front

Ecoregion in Lewis & Clark NF, Rocky Mountains in MT

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The Southern Carbonate Front ecoregion lies east of the Continental Divide and has a more continental climate than ecoregions to the west. Characteristically, its glaciated mountains are often covered by drift or colluvium. Ecoregion 41d is underlain by Mesozoic- Paleozoic limestone and dolomite which is absent from the neighboring Eastern Divide Mountains (17aj), Rattlesnake-Blackfoot-South Swan-Northern Garnet-Sapphire Mountains (17x), and Northern Front (41a); water quality, available water quantity, soils, vegetation, and aquatic biota also differ. The climax vegetation is mapped as mostly subalpine fir and Douglas- fir forests and is distinct from that found west of the Continental Divide in the Eastern Divide Mountains (17aj), the Rattlesnake-Blackfoot-South Swan-Northern Garnet-Sapphire Mountains (17x), the Crestal Alpine-Subalpine Zone (41b), and the Flathead Thrust Faulted Carbonate- Rich Mountains (41e).

— EPA

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