CH 6 時間單位(地質時間單位) 時間岩石單位(時間地層單位) Eon 元 Eonothem 宇 Era 代 Earthem 界 Period 紀 System 系 Epoch 世 Series 統 Age 期 Stage 階 Chron 時段 Chronozone 時帶 zone --最基本的生物地層單位 A zone is a body of rock whose lower and upper boundaries are base on the ranges of one or more taxa - usually species - in the stratigraphic record. regression --A seaward migration of a marine shoreline and of nearby environment. transgression --A landward migration of a marine shoreline and of nearby environment. 1.What kinds of stratigraphic correlation do geologist undertake? fossil 2.What is the difference between the relative and absolute ages of rocks? 相對:兩者比較孰長孰幼 絕對:可找出實際年齡 3.For what interval of geologic time is radiocarbon dating applicable? p.165 Table 6-2 p.167 Holocene ; late Pleistocene (<7000 year) 4.How are strontium(鍶) isotopes useful in dating rocks? 5.Why does a geologic formation not necessarily have upper and lower boundaries that are time-parallel? 6.What factors prevent biostratigraphic zones from having boundaries that are perfectly time-parallel? 構造運動 風化侵蝕...etc. 7.What factors lead to imperfections in radiometic dating? 變質作用 8.Construct a diagram resembling Figure 6-16C to depict the depositional history of a barrier island-lagoon complex that has undergone a regression followed by a transgression. 看不懂 9.Construct a diagram resembling Figure 6-21B showing that a lowering of sea level need not always lead to regression. 看不懂 10.How are seismic profiles used to study regional stratigraphy? p.172-173 11.What is event stratigraphy? The use of geologic records of sudden events, such as the relocation of shorelines or the deposition of volcanic ash, to correlate rocks of widely separated regions. 12.Using the Visual Overview on page 152 as your guide, evaluate the various methods of correlating rocks with regard to age. Which methods are especially useful for intercontinental correlation? --

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