.0
.1
.2
.3
.4
.5
.6
.7
.9
1.0
1.5
2.0
2.5
23.8
65
142
208
248
290
323
354
417
443
495
545
900
2500
.8
1600
Billions of Years Before Present
C
O
S
D
M
Pa
P
Tr
J
K
P-N
Q
ALLEGHANY
PLATEAU
VALLEY &
RIDGE
BLUE
RIDGE
PIEDMONT
(+TR BASINS)
COASTAL
PLAIN
NP
MP
EP
Sedimentary rocks
Sedimentary rocks.
Sandstone, Shale, &
Limestone
Sedimentary rocks.
Sandstone, Shale, &
Limestone
Sedimentary rocks.
Sandstone, Shale
Metamorphic rocks.
Sedimentary and Igneous parent rocks
Igneous and Metamorphic rocks
Metamorphic rocks
Igneous Rocks
Granites & Gabbros
Sedimentary & Igneous rocks
Conglomerate, Sandstone,
Siltstone, Shale, and Basalt
(Triassic Basins)
Sediments
Sediments
Unconsolidated sand,
Sediments
Unconsolidated sand,
sandy clay, and silt
Virginia Province Surface Rock Stratigraphic Column
Time
Period
Metamorphic rocks