Cane Valley Formation has three members. All occur as a narrow curved band, stretching from Nicholas in the north, to Springfield at the easternmost point, to Wheel of Fortune in the south, and are faulted in several places. All are Late Cretaceous (Campanian). Hope Member (oldest) is named for Estate Hope, western St. Croix, VI. Best exposed in Allandale gut (creek) 0.5 mi north of Estate Hope. Lower half contains about equal amounts of green, fine-grained, tuffaceous sandstone and black mudstone; upper half is all mudstone. Thickness is 700 ft. Grades into Cane Valley Formation or overlies Allandale Formation (new) and underlies either Robe Hill or Springfield Members. Robe Hill Member is named for settlement of Robe Hill, just west of Estate Hope. Best exposed in roadcut 2,000 ft north-northeast of Robe Hill. Consists of medium- and coarse-grained, tuffaceous sandstone interbedded in a 3:1 ratio with mudstone. Thickness is 400 ft. Underlain by Hope Member; overlain by Springfield Member. Pinches out to the north. Springfield Member named for Estate Springfield, northeast of Estate Hope. Best exposure is at road of metal quarry at Estate Springfield. Consists of mudstone and fine-grained, tuffaceous sandstone, lithologically indistinguishable from Hope Member. Thickness is 600 ft. Grades into Cane Valley Formation or is overlain by Judith Fancy Formation (new) and underlain by either Robe Hill or Hope Members.

Source: GNU records (USGS DDS-6; Reston GNULEX).

Sequence of members of Cane Valley Formation is shown in figure 4 as Hope Member (oldest; tuffaceous mudstone), Robe Hill Member (tuffaceous sandstone), and Springfield Member (tuffaceous mudstone). Sequence is bounded above and below by gradational contacts. Present in Northside Range.

Source: GNU records (USGS DDS-6; Reston GNULEX).