Geology

Geology in Arctos is used to add descriptive terms to a Locality using Geology Attributes. These terms are controlled by the vocabulary contained in the CTGEOLOGY_ATTRIBUTE code table. For a summary of geologic stratigraphy, see the International Stratigraphic Guide —An abridged version

The terms applied using Geology can generally be summarized in the following groups Stratigraphic Information, Petrology, Biochronology, Public Land Survey System, site land status, and a locality encumbrance attribute for localities that need to be excluded from public view. NOTE Some of these terms (Public Land Survey System, site land stauts, locality encumbrance) are planned for transition to a new Locality Attributes code table in the future but are currently managed under Geology for the time being.

Stratigraphic Information

Geologic strata may be classified according to many different properties. Each classification has its own distinctive nomenclature and some also include a hierarchical structure. The following kinds of strata are currently represented in Arctos:

Petrology

Petrology is the branch of geology that studies rocks and the conditions under which they form and Petrology terms describe the composition and texture of rocks.

Biochronology

In paleontology, biochronology is the correlation in time of biological events using fossils. In its strict sense, it refers to the use of assemblages of fossils that are not tied to stratigraphic sections (in contrast to biostratigraphy, where they are). The basic unit of biochronology is the biostratigraphic zone, or biozone, a collection of fossils found together in a rock unit. The following biozone groups are available in Arctos:

Public Land Survey System

The Public Land Survey System (PLSS) is the surveying method developed and used in the United States to plat, or divide, real property for sale and settling. Terms included for this group include:

Aliquots, a terse, hierarchical reference to a piece of land, in which successive subdivisions of some larger area are appended to the beginning of the reference. For example, SW1/4 NW1/4 S13, T1SR20E refers to the southwest quarter of the northwest quarter of section 13 of Township 1 South Range 20 East (a 40-acre parcel). may be added, but this requires coordination with the Arctos DBA.

Site Land Status

Site land status is meant to designate private lands through the use of ownership terms. Lands can be designated as private with the “private” Site Land Status” attribute and property ownership can be recorded in the attribute remark.

Locality Encumbrance

When it is necessary to hide a locality from public view, use the private (access) attribute. For more on this attribute, see Encumbering Locality.

Geology Attributes

Geology Attributes attach geology information to Locality. Each locality may contain any number of geology attributes. Each Geology Attribute may be accompanied by a determiner (an Arctos Agent), determination date, determination method, and a remark.

Structure

UAM@ARCTOS> desc geology_attributes

Name                                   Null?    Type
GEOLOGY_ATTRIBUTE_ID                   NOT NULL NUMBER
LOCALITY_ID                           NOT NULL NUMBER
GEOLOGY_ATTRIBUTE                      NOT NULL VARCHAR2(255)
GEO_ATT_VALUE                          NOT NULL VARCHAR2(255)
GEO_ATT_DETERMINER_ID                       NUMBER
GEO_ATT_DETERMINED_DATE                           DATE
GEO_ATT_DETERMINED_METHOD                          VARCHAR2(255)
GEO_ATT_REMARK                                 VARCHAR2(4000)

 

Searching

Geology attributes are asserted individually, however, portions of the code table include a hierarchical structure which makes it possible to locate cataloged items attributed to strata which is more specific than the search term.