Step back and look at virginia from space and we see a certain degree of complexity.
Petersburg granite virginia geology.
Multiple intrusive phases are present.
Light to dark gray to pink fine to coarse grained equigranular to porphyritic foliated to nonfoliated ranges from granite to granodiorite in composition.
Jonas 1927 1929 formally named the peterbsurg granite.
The granite contains xenoliths of biotite gneiss and amphibolite.
Geology is fractal that is the detail and complexity of what we observe remains the same regardless of the scale of observation.
Generalized geologic map of the petersburg batholith in east central virginia.
The central part of chesterfield county is underlain by the petersburg granite a large granitic pluton of mississippian age age dated to about 330 million years old.
Petersburg granite mississippian at surface covers 20 of this area light to dark gray to pink fine to coarse grained equigranular to porphyritic foliated to nonfoliated ranges from granite to granodiorite in composition.
Multiple intrusive phases are present.
Multiple intrusive phases are present.
Geologic unit mapped in virginia.
The batholith is primarily composed of granite including massive and foliated both magmatic and solid state fabrics varieties.
From the earliest investigations of the batholith it was recognized that multiple intrusive phases are present.
Multiple intrusive phases are present.
Petersburg granite mississippian at surface covers 3 of this area light to dark gray to pink fine to coarse grained equigranular to porphyritic foliated to nonfoliated ranges from granite to granodiorite in composition.
Petersburg granite mississippian at surface covers 24 of this area light to dark gray to pink fine to coarse grained equigranular to porphyritic foliated to nonfoliated ranges from granite to granodiorite in composition.
Geologic units in chesterfield county virginia petersburg granite mississippian at surface covers 29 of this area light to dark gray to pink fine to coarse grained equigranular to porphyritic foliated to nonfoliated ranges from granite to granodiorite in composition.
The granite contains xenoliths of biotite gneiss and amphibolite.
On the 1928 geologic map of virginia stose 1928 the petersburg granite was designated as precambrian but jonas 1932 later interpreted it to be late paleozoic.
Ct chopawamsic terrane gt goochland terrane rt raleigh terrane rrt roanoke rapids terrane.
The petersburg granite forms the bedrock over a large area in east central virginia and one of the best places to see it is along the james river in richmond.
