Relations of Plants to Geology and Soil

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    • These six display cases show landscapes shaped by different rocks. The type of rock affects the composition of soil and influences which plants grow where.

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Gneiss

Gneiss

In the soil profile from the adjacent forest of red white, and chestnut oaks, humus forms only a thin surface layer.

Limestone

Limestone

The soil profile of the limestone slopes consists entirely of a loose, rich humus.

Calcareous Bog

Calcareous Bog

Calcareous bogs or swamps in northeastern United States are frequently “mined” for humus.

Marl

Marl

The soil profile is composed mainly of shells.

Shale

Shale

The soil profile from shale woodlands shows that humus accumulates moderately in these forest over a long period of time.

Quartzite

Quartzite

The soil profile shows a very thin layer of humus.