interval zone
interval zone (interbiohorizon zone, biostratigraphic interval-zone) The unit of strata lying between the top boundary of a distinctive lower biostratigraphic unit and the base of an equally distinctive, but different, upper biostratigraphic unit. An interval-zone may or may not contain fossils.
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biotopographic unit , biotopographic unit
1. A small habitat unit with distinctive topography formed by the activities of an organism (e.g. an ant hill).
2. A small topogr… distinct , dis·tinct / disˈtingkt/ • adj. 1. recognizably different in nature from something else of a similar type: the patterns of spoken language are distinc… United Biscuits (Holdings) plc , u·nit / ˈyoōnit/ • n. 1. an individual thing or person regarded as single and complete, esp. for purposes of calculation: the family unit. ∎ each of… Si Units , SI units Systéme International d'Unités: the international system of units now recommended for all scientific purposes. A coherent and rationalized s… Upper , up·per1 / ˈəpər/ • adj. 1. situated above another part: his upper arm the upper atmosphere. ∎ higher in position or status: the upper end of the soci… International System Of Units , The International System of Units (SI), which began as the decimal metric system during the French Revolution, deals with the definitions, terminolog…
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interval zone