Subclass of:

• crmsci:S20 Rigid Physical Feature

Superclass of:

• crmarc:A2 Stratigraphic Volume Unit
• crmarc:A3 Stratigraphic Interface
• crmarc:A7 Embedding

Scope note:

This class comprises instances of S20 Rigid Physical Features which appear as the result of a stratigraphic genesis event or process. The form of an instance of A8 Stratigraphic Unit should be of a kind that can be attributed to a single genesis event or process and has the potential to be observed. One genesis event may have created more than one SU. An instance of A8 Stratigraphic Unit is regarded to exist as long as a part of its matter is still in place with respect to a surrounding reference space, such that its spatial features can be associated with effects of the genesis process of interest.

This also implies that a certain degree of coherent (“conformal”) deformation is tolerable within its time-span of existence. Therefore, the place an instance of A8 Stratigraphic Unit occupies can be uniquely identified with respect to the surrounding reference space of archaeological interest

Examples:

post holes “[7]” and “[8]” (A3) in Figure 4

the one-meter-thick level of pumice caused by the Minoan eruption of Thera, which consists of five distinct layers and covers the ruins at the excavation Akrotiri, Thera –see Figure 9 (Doumas et al., 2015)

In First Order Logic:

• A8(x) ⇒ S20(x)

Outgoing properties:

• crmarc:AP11 has physical relation to (is physical relation from) (0,n:0,n) → crmarc:A8 Stratigraphic Unit

Incoming properties:

• crmarc:A1 Excavation Processing Unit → crmarc:AP5 removed part or all of (was partially or totally removed by) (0,1:0,n)
• crmarc:A4 Stratigraphic Genesis → crmarc:AP7 produced (was produced by) (0,1:0,n)
• crmarc:A5 Stratigraphic Modification → crmarc:AP8 disturbed (was disturbed by) (0,1:0,n)
• crmarc:A8 Stratigraphic Unit → crmarc:AP11 has physical relation to (is physical relation from) (0,n:0,n)