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Mollisol is a soil type which has deep, high organic matter, nutrient-enriched surface soil , typically between 60 and 80 cm (24-31 in) in depth. This fertile surface horizon, called a mollic epipedon, is the defining diagnostic feature of Mollisols.
The primary river of the dunes is the Calumet River. Its three segments were once a single waterway, parallel to the Lake Michigan Shoreline. [4] On the east is Trail Creek in Michigan City, Indiana. The Calumet River is accessible at several locations. The upper reaches are viewable in the Heron Rookery. [2]
The soils, mostly Vertisols and Mollisols, are deep, loamy and clayey, and tend to be finer-textured than in the Lower Rio Grande Valley (34e) to the north. Some Entisols and Inceptisols occur near the river. The floodplain ridges once had abundant palm trees, and early Spanish explorers called the river "Rio de las Palmas." Most large palm ...
This is a large area covering 407,000 square kilometres (157,000 sq mi) from northern Illinois through most of Missouri, eastern Kansas, Oklahoma and into Texas.This area was traditionally a mixture of woodland and tall grass prairie, which as the soil consists of highly fertile mollisols, most of the area has been converted to farmland.
Grassy woodlands surrounded much of the continent's central tallgrass prairie and shortgrass prairie. Fire also swept the Rocky Mountains aspen as frequently as every ten years, creating large areas of parkland. [1] In the far southwest was California oak woodland and Ponderosa Pine savanna, while further north was the Oregon White Oak savanna.
Tallgrass prairie remnants can also be found among nature preserves within the Hobart Nature District, located in Hobart, Indiana just outside of Chicago. The original extent of tallgrass prairie in Canada was the 2,300-square-mile (6,000 km 2 ) plain in the Red River Valley , southwest of Winnipeg in Manitoba ( see map). [ 10 ]
Mixed prairie are the lighter and more sandy soils, found on the heights. The dominant plants are the needle and thread grass , western wheatgrass , Junegrass , along with short grass plants. There is a wider mix of vegetation which becomes more noticeable in spring and early summer when broom snakeweed , fringed sage , plus various forbs ...
The second sub-ecoregion is the Central USA Plains, an area of 253,665 square kilometres (97,941 sq mi), that has a landform of smooth plains. The majority of this region’s surface material is moraine with some lacustrine, and the soil consists of calcium enriched prairie soils and forest soils on moraine.