releve Virginia Division of Natural Heritage, see http://www.dcr.virginia.gov/natural_heritage/documents/nh_plotform_instructions.pdf
Overall Taxon Cover Values are Automatically Calculated?
no
Stem Observation Area
100
m²
Plot Quality Fields:
Plot Validation Level
(2) classification plot: sufficient for inclusion in a classification revision
Overall Plot Vegetation Fields:
Tree Height
6
m
Tree Cover
15
%
Shrub Cover
12
%
Field Cover
25
%
Nonvascular Cover
45
%
Misc Fields:
Observation Narrative
Plot captures the vegetation of a small cliff of red Triassic siltstone (Ball's Bluff Formation) undercut by Bull Run. Although open, a northeast aspect fosters submesic conditions. Vegetation is fairly diverse, rooting in numerous holes, crevices, and moss- or humus-covered shelves. Microstegium vimineum has established itself with some abundance, even in rock crevices. This vegetation is well below minimum mapping unit size (0.5 ha) for the project, but is rather distinctive and recurs on similar outcrops throughout the northern Virginia Triassic Basin.