| lithogenetic unit | A local mappable assemblage o f rock strata, such as a formation, member, or bed, considered without regard to time (schenck and muller, 1941). |
| allostratigraphic unit | A mappable stratiform body o f sedimentary rock defined and identified on the basis o f its bounding discontinuities (north american stratigraphic code, 1983, p. 865-867). |
| pedoderm | A mappable unit mantle o f soil, entire or partially truncated, at the earth`s surface or partially or wholly buried, which has physical characteristics and stratigraphic relationships that permit... |
| interthem | A minor unconformity-bounded unit comparable in thickness with a formation or in time span with a stage (chang, 1975, p. 1544). several interthems may be recognized within a synthem. |
| total vacuity | A missing interval or hiatus in a stratigraphic sequence caused by both erosion and nondeposition (wheeler, 1958b, p. 1058). |
| bioseries | A morphogenetic sequence marked by stages in the progressive structural development o f morphological character o f index fossils (glaessner, 1945, p. 225). |
| isobiolith | A para-time-rock unit defined by its contained fossils (wheeler et al., 1950, p. 2362). |
| parasequence | A relatively conformable succession of genetically related beds or bedsets bounded by marine-flooding surfaces and their correlative surfaces (van wagoner, 1985, p. 91-92; van wagoner et al., 1987... |
| miosynthem | A relatively small, minor synthem within a larger synthem but not a component o f a hierarchy o f unconformity-bounded units (international subcommission on stratigraphic classification, 1987a, p.... |
| systems tract | A rock body that groups several intergradational and, in part, contemporaneous depositional systems; for example, fluvial, delta, shelf, and slope systems (brown and fisher, 1977, p. 215). t |
| thanatocoenosis | A set of fossils brought together after death by sedimentary processes, rather than by virtue of having originally lived there collectively (see section 7.b.2). |
| paracontinuity | A small-scale disconformity traceable over a wide geographic area. it exhibits slight, but distinct, channeling and is associated with a slight, but significant, faunal discontinuity (conkin and c... |
| boundary-stratotype | A specific sequence of rock strata in which a specific point is designated that serves as the standard for the definition and recognition of a stratigraphic boundary (see section 4.b.3). c |
| geochrone | A standard unit o f geologic time (h. s. williams, 1893b, p. 294). |
| polarity-reversal transition-zone | A stratigraphic interval greater than 1 m thick across which a change in magnetic polarity is recorded (north american |
| time-set unit | A stratigraphic unit arranged in time-continuous sets (“time-sets”) representing a continuous span o f time (henningsmoen, 1961, p. 66). |
| biostratic unit | A stratigraphic unit based on paleontologic data; an abbreviation o f the term “biostratigraphic unit” (henningsmoen, 1961, p. 63, 68). |
| ecostratigraphic unit | A stratigraphic unit based on the mode o f origin or the environment o f deposition o f the rocks that compose it (hedberg, 1958, p. 1893). |
| para-time-rock unit | A stratigraphic unit intrinsically diachronous; it expresses chronology and should approach synchrony (wheeler et al., 1950, p. 2364). 133 |
| protostratic unit | A stratigraphic unit whose boundaries delimit and embrace beds with a common physical property, such as a particular lithology or a particular fossil content (henningsmoen, 1961, p. 66). r |
| lectostratotype | A stratotype for a previously described stratigraphic unit selected later in the absence of an adequately designated original stratotype (holostratotype) (see section 4.b.7.c). 125 lens (lentil, l... |
| composite-stratotype | A stratotype formed by the combination of several specified type intervals of strata or type areas known as component-stratotypes (see section 4.b.4). |
| hypostratotype | A stratotype proposed after the original designation of the holostratotype (and parastratotype) in order to extend knowledge of the unit or boundary to other geographic areas (see section 4,b.7.e)... |
| biostratigraphic unit | A stratum or body of strata that is defined or characterized on the basis of its fossil content or paleontological character (see chapter 7). |
| facies sequence | A succession o f vertical facies (teichert, 1958b, p. 2723). |
| parasequence set | A succession of genetically related parasequences which form a distinctive stacking pattern that is bounded by major marine-flooding surfaces and their correlative surfaces (van wagoner et al., 19... |
| faciostratotype | A supplementary stratotype designated for local reference or reference to different facies, which distinguishes different ecologic conditions that existed during the time o f the chronostratigraph... |
| parastratotype | A supplementary stratotype used in the original definition by the original author to illustrate the diversity or heterogeneity of the defined stratigraphic unit or some critical feature not eviden... |
| lithostratigraphic horizon | A surface of lithostratigraphic change, commonly the boundary of a lithostratigraphic unit, or a lithologically distinctive very thin marker bed within a lithostratigraphic unit (see section 5.c.9... |
| marine-flooding surface | A surface that separates younger from older strata, across which there is evidence of an abrupt increase in water depth (van |
| bedding surface | A surface, usually conspicuous, within a sequence of stratified rocks, representing an original surface of deposition; the surface of separation or interface between two adjacent beds of sedimenta... |
| assise a | A term approved by the 2nd international geological congress (bologna, 1881) for a stratigraphic unit next in rank below stage and equivalent to a substage. b. a term suggested by p. f. moore (195... |
| baselap | A term describing termination o f strata along the lower boundary o f a depositional sequence, used only where discrimination between onlap and downlap is difficult or impossible (mitchum, 1977, p... |
| erosional vacuity | A term used by wheeler (1958b, p. 1057), later replaced by “degradation vacuity” (wheeler, 1964, p. 602). |
| prostratigraphy | A term used for “preliminary stratigraphy” including lithologic and paleontologic studies without consideration o f the time factor (schindewolf, 1954a, p. 25). |
| magnetopolarity zone | A term used instead of “polarity zone” when there is risk of confusion with other kinds of polarity (north american stratigraphic code, 1983, p. 862). |
| mesothem | A time-significant stratigraphic unit forming major cycles o f deposition which are normally bounded above and below by unconformities on shelf areas, but which have their limits defined by marker... |
| mixed topostratic unit | A topostratic unit with the lower boundary based on lithologic data and the upper boundary based on paleontologic data, or vice versa (henningsmoen, 1961, p. 74). |
| diachronic unit | A unit o f geologic time that comprises the unequal spans o f time represented either by a specific lithostratigraphic, allostratigraphic, biostratigraphic, or pedostratigraphic unit, or by an ass... |
| system-group | A unit o f the highest rank in the category o f lithostratigraphic units (h. wang, 1966). |
| geochronologic unit | A unit of geologic time (see sections 2.d, 3.a.11, and 9. a). |
| geochronometric unit | A unit of geologic time expressed quantitatively in thousands or millions of years. |
| polarity zone | A unit of rock characterized by the polarity of its magnetic signature; the fundamental unit of magnetopolarity classification (north american |
| phylozone | A. a belt o f rock formed during a biochron (van hinte, 1969, p. 271; see section 7.d.4.c). b. equivalent to lineage zone (international stratigraphic guide, 1976, p. 58-59). |
| interval zone | A. a biozone consisting of the body of fossiliferous strata between two specified biostratigraphic horizons (biohorizons) (see section 7.d.3). b. a body o f strata between two specified, documente... |
| consecutive-range zone | A. a body o f strata within the range o f a fossil group such that it forms the first part o f the range o f that fossil group before the appearance o f its immediate evolutionary descendent (repo... |
| geosol | A. a laterally traceable, mappable, geologic weathering profile that has a consistent stratigraphic position (morrison, 1967, p. 3). b. the fundamental and only unit in pedostratigraphic classific... |
| polarity excursion | A. a magnetostratigraphic polarity unit that may not be clearly classifiable as normal or reversed but may be designated as intermediate in direction. b. a swing in the direction o f the earth`s d... |
| lithostratic unit | A. a protostratic unit based on lithologic data (henningsmoen, 1961, p. 72-74). b. an abbreviation o f the term “lithostratigraphic unit.” |
| chronostratic unit | A. a stratigraphic unit with time boundaries (henningsmoen, 1961, p. 66, 75-79). b. an abbreviation o f the term “chronostratigraphic unit.” 113 |
| ecostratigraphy | A. stratigraphy based on the ecology o f life forms (schindewolf, 1950, p. 35). b. the study and classification o f stratified rocks according to their mode o f origin or their environment o f dep... |
| local-range zone | A. the range zone o f a taxon in a specific, geographically located section or area (american commission on stratigraphic nomenclature, 1957, report 5, p. 1883). equivalent to teilzone, topozone (... |
| sequence stratigraphy | A. the study of rock relationships within a chronostratigraphic framework of repetitive, genetically related strata bounded by surfaces of erosion or nondeposition or their correlative conformitie... |
| wagoner e | Al., 1987, p. 11). |
| biohorizon | An abbreviation of the term “biostratigraphic horizon” (see section 7.c.4). |
| chronohorizon | An abbreviation of the term “chronostratigraphic horizon” (see section 9.b.4). |
| lithohorizon | An abbreviation of the term “lithostratigraphic horizon” (see section 5.c.9). |
| faunal break | An abrupt change or break from one fossil assemblage to another at a definite horizon in a stratigraphic sequence, usually produced by an unconformity or hiatus, or sometimes by a change in bottom... |
| isotopic age | An age expressed in years or millions of years calculated from the quantitative determination of the content of the parent and daughter nuclides during the decay of radioactive elements. the abbre... |
| allogroup | An allostratigraphic unit next in rank above an alloformation (see allostratigraphic unit). 107 |
| allomember | An allostratigraphic unit next in rank below an alloformation (see allostratigraphic unit). |
| cenozonite | An alternative term for assemblage zone (henningsmoen, 1961, p. 68). |
| causal stratigraphy | An approach to stratigraphic problems based on ecosystem analysis o f interrelations between geologic events and organic evolution (krassilov, 1974, p. 170). |
| arbitrary cutoff | An arbitrary boundary separating two laterally intergrading stratigraphic units that differ from each other in some arbitrarily defined way (wheeler and mallory, 1953, p. 2412). |
| supersome | An assemblage o f contiguous and depositionally sequential chronosomes (schultz, 1982, p. 29-31). |
| barren interzone | An interval lacking in fossils between successive biozones (international |
| barren intrazone | An interval o f substantial thickness without fossils within a biozone (international stratigraphic guide, 1976, p. 49). |
| disconformity | An unconformity in which the bedding planes above and below 116 the stratigraphic break are essentially parallel; this apparent parallelism is restricted in areal extent (see section 6.b.2.b). несоответствие; |
| chronomere | Any interval o f geologic time (report o f the stratigraphical code sub- |
| stratomere | Any segment o f a rock sequence (report o f the stratigraphical code sub- |
| merostratic unit | Any stratic unit based on a partial range (henningsmoen, 1961, p. 67). |
| archaeostratigraphy | Archaeostratigraphic classification. see ethnostratigraphy. |
| chronostratigraphic unit | Body of rocks that includes all rocks formed during a specific interval of geologic time (see chapter 9, especially section 9.b.3). |
| stratigraphi | - Code, 1983, p. 850, 865). global boundary stratotype section and point (gssp). the selected type or standard for the definition and recognition of a stratigraphic boundary between two named st...
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| time-level correlation | Correlation o f time-levels (henningsmoen, 1961, p. 64). |
| inter-level correlation | Correlation o f two intervals that represent the same span o f time (henningsmoen, 1961, p. 65). |
| there are many kinds of zones | Depending on the stratigraphic properties under consideration—lithozones, biozones, chronozones, magnetic-polarity zones, and so on. the kind of zone being used should be clearly indicated (see se... |
