About This Item
- Full TextFull Text(subscription required)
- Pay-Per-View PurchasePay-Per-View
Purchase Options Explain
Share This Item
Nearshore and Shelf Systems
Tidal Sand Sheets of the Late Albian Joli Fou-Kiowa-Skull Creek Marine Transgression, Western Interior Seaway of North America
Subsurface facies analysis of the Lower Cretaceous hydrocarbon-bearing Basal Colorado Sandstone in the Cessford and Countess fields of southern Alberta, Canada reveals a tidal sand sheet facies (100 km × 30 km × 10 m) displaying cross-stratification, mud couplets, tidal bundles and reactivation surfaces. The Basal Colorado Sandstone was deposited in the Western Interior Seaway as a basal transgressive unit during the Joli Fou transgression (Kiowa-Skull Creek equivalent, earliest Late Albian). This sandstone overlies tidal flat-lagoon-coastal swamp sediments of the Mannville Group and underlies open marine shales of the Joli Fou Formation.
Other stratigraphically equivalent sandstone units studied in outcrop (the Sunkay Member in the Ghost River section in southern Alberta, and the Lower Flood Member of the Blackleaf Formation in Montana, U.S.A.) and in the subsurface (Spinney Hill Sandstone in southwestern Saskatchewan) also reveal characters indicative of a tidal sand sheet facies.
A regional compilation of isopach maps of these sandstones, the available paleocurrent data and a previously compiled paleotidal regime map were used to reconstruct the paleogeography of the Lower Cretaceous tidal sea. Although the Cretaceous Western Interior Seaway was wave dominant, it seems that during periods of transgression, tidal currents did transport and deposit large amounts of sand.
Pay-Per-View Purchase Options
The article is available through a document delivery service. Explain these Purchase Options.
|Protected Document: $10|
|Internal PDF Document: $14|
|Open PDF Document: $24|