Here are the principal geological terms used in the descriptions of the units.
Channel: A linear, commonly concave-based depression through which water and sediment flow and into which sediment can be deposited in distinctive, often elongated bodies. Channels can occur in a variety of morphologies, e.g., straight, meandering or braided.
Facies: The overall characteristics of a rock unit that reflect its origin and differentiate the unit from others around it. Mineralogy and sedimentary source, fossil content, sedimentary structures and texture distinguish one facies from another.
Lamination: A fine layer (~ 1 mm thick) in strata, also called a lamina, common in fine-grained sedimentary rocks such as shale, siltstone and fine sandstone. A sedimentary bed comprises multiple laminations, or laminae.
Lithofacies: A mappable subdivision of a stratigraphic unit that can be distinguished by its facies or lithology: the texture, mineralogy, grain size, and the depositional environment that produced it.
Marl: Sediment composed of clay mixed with calcium carbonate.
Cross bedding: Bedding that was inclined when originally deposited; it formed by variable current or wave action, or by wind (sand dunes). The beds slope downwards in the direction the water or wind was moving.