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The best fossils of [[leaf |leaves]] are found preserved in layers of [[sediment]] that have been compressed in a direction [[perpendicular]] to the plane of the deposited sediment. Since leaves are basically flat, the resulting distortion is minimal. [[Plant stem]]s and other three-dimensional plant structures do not preserve as well under compression. Typically, only the basic outline and surface features are preserved in compression fossils. Internal [[anatomy]] is not preserved.
Compression fossils are formed most commonly in [[ecosystem|environment]]s where fine sediment is deposited, such as in [[river delta]]s, [[lagoon]]s, along [[river]]s, and in [[pond]]s. The best rocks in which to find these fossils preserved are [[clay]] and [[shale]], although [[volcanic ash]] may sometimes preserve plant fossils as well.
==References==
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