POSC Specifications
Version 3.0
Epicentre Standard Values
ref_geometrical_relationship

ref_geometrical_relationship

Standard Instance Values

identifier naming _system description source source _reference version status
  naming _system .identifier       ref _version .identifier  
top POSC basic The highest point, level or part of something. this does not distinguish between the physical top and the stratigraphic top. POSC Websters epicentre 2.2 provisional
physical top POSC basic The highest point at the present time. This may be the stratigraphic base of an overturned bed. POSC   epicentre 2.2 provisional
stratigraphic top POSC basic The latest depositional part. POSC   epicentre 2.2 provisional
base POSC basic The lowest point. No distinction is made between physical base and stratigraphic base. POSC Websters epicentre 2.2 provisional
physical base POSC basic The lowest point at the present time. This may be the stratigraphic top of an overturned bed. POSC   epicentre 2.2 provisional
stratigraphic base POSC basic The part initially deposited. POSC   epicentre 2.2 provisional
near the top POSC basic A zone or point approaching the highest level of a feature but not exactly or identifiably coinciding with that position. POSC   epicentre 2.2 provisional
near the base POSC basic A zone or point approaching the lowest level of a feature but not exactly or identifiably coinciding with that position. POSC   epicentre 2.2 provisional
interbedded POSC basic Said of beds lying between or alternating with others of different character. POSC AGI Glossary of Geology epicentre 2.2 provisional
onlap POSC basic A base-discordant relation in which initially horizontal strata terminate progressively against an initially inclined surface, or in which initially inclined strata terminate progressively updip against a surface of greater initial inclination. POSC Glossary of Seismic Stratigraphy epicentre 2.2 provisional
downlap POSC basic A base-discordant relation in which initially inclined strata terminate downdip against an initially horizontal or inclined surface. POSC Glossary of Seismic Stratigraphy epicentre 2.2 provisional
toplap POSC basic Termination of strata against an overlying surface mainly as a result of nondeposition with perhaps only minor erosion. POSC Glossary of Seismic Stratigraphy epicentre 2.2 provisional
truncation POSC basic Termination of strata or seismic reflections interpreted as strata along an unconformity surface due to post-depositional erosional or structural effects. POSC Glossary of Seismic Stratigraphy epicentre 2.2 provisional
fault intersection POSC basic Termination of strata or seismic reflections interpreted as strata along a fault surface. POSC   epicentre 2.2 provisional
upthrown restored top POSC basic An upthrown restored top is the estimated top the formation would have had in the upthrown block if the formation had not been faulted out. POSC Subsurface Geologic Mapping epicentre 2.2 provisional
downthrown restored top POSC basic An downthrown restored top is the estimated top the formation would have had in the downthrown block if the formation had not been faulted out. POSC Subsurface Geologic Mapping epicentre 2.2 provisional
pinch-out POSC basic The termination or end of a stratum, vein, or other body of rock that narrows or thins progressively in a given horizontal direction until it disappears and the rocks it once separated are in contact. POSC AGI Glossary of Geology epicentre 2.2 provisional
spillpoint POSC basic The point of maximum filling of a structural trap by oil or gas. POSC AGI Glossary of Geology epicentre 2.2 provisional
trap POSC basic Any barrier to the upward movement of oil or gas, allowing either or both to accumulate. A trap includes a reservoir rock and an overlying or updip impermeable roof rock. POSC AGI Glossary of Geology epicentre 2.2 provisional

ref_geometrical_relationship

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identifier naming _system description source source _reference version status
boundary stratotype POSC basic A specific point in a specific sequence of rock strata that serves as a standard for definition and recognition of a stratigraphic boundary. POSC AGI Glossary of Geology epicentre 2.2 provisional
type section POSC basic The originally described sequence of strata that constitute a stratigraphic unit. It serves as an objective standard with which spatially separated parts of the unit may be compared, and it is preferably in an area where the unit shows maximum thickness and is completely exposed (or at least shows top and bottom) POSC AGI Glossary of Geology epicentre 2.2 provisional
absent by faulting POSC basic Strata that is absent from a subsurface rock segment due to faulting. POSC   epicentre 2.2 provisional
absent by erosion POSC basic Strata that is absent from another geologic object due to erosion. POSC   epicentre 2.2 provisional
absent reason unknown POSC basic Strata that is absent from another geologic for unknown reasons. POSC   epicentre 2.2 provisional
hanging wall POSC basic The overlying side of a fault. For a normal fault, the hanging wall is the downthrown side. For a reverse fault, the hanging wall is the upthrown side. POSC   epicentre 2.1 current
footwall POSC basic The underlying side of a fault. For a normal fault, the footwall is the upthrown side. For a reverse fault, the footwall is the downthrown side. POSC   epicentre 2.1 current

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