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* Often provide a more complete section of the stratigraphic unit
* Often provide a more complete section of the stratigraphic unit
* Better preservation of contacts between units having significantly different resistances to weathering
* Better preservation of contacts between units having significantly different resistances to weathering
* Better preservation of delicate primary and soft sediment deformation structures in shale and siltstone units
* Better preservation of delicate primary and soft sediment [[deformation]] structures in shale and siltstone units
* Better preservation of trace fossils
* Better preservation of trace fossils
* Ability to obtain material for petrographic study below the present groundwater table
* Ability to obtain material for petrographic study below the present groundwater table