Glossary_ID,Definition
GLO03|A bed is a layer of sedimentary rocks or sediments bounded above and below by bedding surfaces. A single bed is a sedimentation unit which has been deposited under essentially constant physical conditions- (Otto, 1938, paraphrased in Reineck and Singh, 1980, p. 95). -Sedimentation units greater than 1 cm thick are known as beds, and their upper and lower surfaces are known as bedding [planes] or bounding planes... (Collinson and Thompson, 1989, p. 6).  The composition and texture within a bed may be:  (1) uniform or heterogeneous; 2) rhythmically variable; or (3) systematically gradational- (Campbell, 1967, p. 14).
GLO01|Sample locality and 40Ar-39Ar age determination. age in millions of years (<chr(177)>1-sigma  error)
GLO35|Sample locality and radiocarbon age determination. Conventional corrected radiocarbon ages, referenced to A.D. 1950, calculated on basis of Libby half-life of 5568 years; 1-sigma error based on combined measurements of sample, background, and modern reference standards. Calibrated ages, referenced to A.D. 1950, calculated on basis of CALIB REV4.4.2 using intcal98 calibration data set (Stuiver and others, 1998) and a laboratory error multiplier of 1; where multiple intercepts calculated, we list solutions in order of greatest likelihood summing to >90 percent of the probability density function. * 13C/12C not measured; value of -25 <chr(8240)> assumed for determining conventional corrected age.  WW samples analyzed in U.S. Geological Survey radiocarbon laboratory, Reston, Virginia by J. McGeehin; Beta samples analyzed by Beta Analytic, Inc., Miami, Florida.
GLO18|Primary layering in sedimentary rock, formed in a near-horizontal orientation. Presently inclined. Azimuth and inclination are strike and dip, respectively
GLO19|Layering in igneous rock that may be defined by variations in composition or by preferred orientation of mineral grains. Presently inclined. Azimuth and inclination are strike and dip, respectively
GLO14|Locality at which recognizable remains of past life were found
GLO06|Boundary between two identifiable, adjacent masses of rock. A surface in 3-D space that intersects the map horizon (Earth's surface) to form a line on the map
GLO13|A contact (boundary between two identifiable adjacent masses of rock) along which there has been significant slip. A surface in 3-D space that intersects the map horizon (Earth's surface) to form a line on the map
GLO30|An inclined contact along which there has been significant slip and the upper body of rock has slipped down relative to the lower body of rock
GLO37|An inclined contact along which there has been significant slip and the upper body of rock has slipped up relative to the lower body of rock
GLO40|A steeply inclined contact along which there has been significant slip, one body has moved horizontally relative to the other, and--facing across the contact--the farther body has moved to the right
GLO27|Calculated line that bounds mapped area
GLO09|Sheet-like body of rock, most commonly of igneous origin, though clastic (sedimentary) dikes are relatively common.  If host rock (wall rock) has layering, dike is discordant to layering
GLO08|Calculated line along which a depth profile (cross-section) is drawn. Cross sections may be based on extensive subsurface observations and have a high probability of being correct, or may be based largely on the mapper's intuition
GLO22|
GLO32|Entire described unit consists of a single part or constituent
GLO02|Component constitutes effectively 100 percent of the volume of the map unit
GLO26|Component constitutes more than 25 percent of the volume of the map unit
GLO41|Component constitutes less than 25 percent of the volume of the map unit
GLO34|Component is present in the map unit, but proportion is unknown
GLO28|Component constitutes less than 10 percent of the volume of the map unit
GLO15|Property that specifies the genetic environment in which a geologic unit formed or an event occurred.
GLO04|X-ray fluorescence analyses. Rock-type names assigned in accordance with IUGS system (Le Maitre, 2002) applied to recalculated analyses. FeO*, total Fe calculated as FeO; Mg#, atomic ratio 100Mg/(Mg+Fe2+) with Fe2+ set to 0.85x Fetotal; observed and normalized oxide abundances reported as weight percent. Modes measured by point-counting of thin sections, secondary minerals counted as primary mineral replaced; modal abundances reported in volume percent. Trace element abundances reported as parts per million (PPM), by weight.
GLO07|Radiocarbon age referenced to A.D. 1950, calculated on basis of Libby half-life of 5568 years, and calculated with assumed average initial C14 concentration
GLO10|Paragraph style: Times New Roman, Regular, 10 pt, 12 pt leading, left justified, 66 pt left indent, <chr(8211)>20 pt 1st line indent
GLO11|Paragraph style: Times New Roman, Regular, 10 pt, 12 pt leading, left justified, 66 pt left indent, <chr(8211)>10 pt 1st line indent
GLO16|Paragraph style: Times New Roman, Bold, 10 pt, 12 pt leading, all caps, centered, 12 pt space before
GLO20|Position of geologic feature (contact, fault) located on basis of interpolation from distant outcrops of feature and (or) constraints posed by nearby outcrops that limit possible position of feature
GLO25|Millions of years; used for both durations (Cenozoic Era has lasted for 65 Ma) and dates (Cretaceous Period began at about 146 Ma)
GLO31|Position of geologic feature (contact, fault) located on basis of direct outcrop observation and (or) interpolation from nearby outcrops
GLO38|Time-averaged boundary of a waterbody. In tidal regimes, differs from waterline which is margin of a waterbody at an instant
GLO24|Attribute assignment is uncertain
GLO39|Attribute is considered by mapper to be assigned with an acceptably reliable level of confidence
GLO33|Larger network of faults that a single fault arc, segment, or strand is part of. It is commonly presumed that elements of a parent fault zone have similar slip directions and histories
GLO29|Not Applicable
GLO17|Paragraph Style: Times New Roman, Regular, 10 pt, 12 pt leading, all caps, centered, 10 pt space before
GLO05|Position of geologic feature (contact, fault) concealed; location inferred on basis of extrapolation from unconcealed areas and geologic reasoning
GLO36|Component constitutes less than 3 percent of the volume of the map unit
GLO12|Component constitutes more than 50 percent of the volume of the map unit
GLO21|
GLO23|Lines and points that are not located by a mapping process; may be defined a priori or be arbitrary
