Cretaceous/Tertiary boundary sediment

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doi: 10.1130/SPE229-p143
Author(s): Hsü, Kenneth J.
Author Affiliation(s): Primary:
Swiss Fed. Inst. Technol., Zurich, Switzerland
Volume Title: Sedimentologic consequences of convulsive geologic events
Volume Author(s): Clifton, H. Edward, editor
Source: Special Paper - Geological Society of America, Vol.229, p.143-154; Geological Society of America, Sedimentary Petrology Division, Inaugural symposium, Orlando, FL, Oct. 28, 1985, edited by H. Edward Clifton. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0072-1077. ISBN: 0-8137-2229-2 CODEN: GSAPAZ
Note: In English. 48 refs.; illus. incl. strat. cols.
Summary: In many parts of the world a thin clay or marly unit marks the boundary between Cretaceous and Tertiary rocks. In marine sequences this boundary is defined by the first appearance of typically Paleocene marine plankton in the clay. In continental rocks, the boundary sediment yields the stratigraphically highest occurrence of a Cretaceous assemblage of fossil pollen. Detailed analyses of the marine boundary sediment at Caravaca, Spain, permit a three-fold subdivision: the lowest is apparently a fallout deposit of impact ejecta, preserved as a 0.5-cm lamina of red clay. The main subdivision is a black or dark gray clay or marl, containing reworked extraterrestrial debris, laid down in an oxygen-deficient environment. The uppermost boundary clay is lighter gray in color, transitional in lithology to the overlying Paleocene sediments, which were deposited after the recovery from the terminal Cretaceous convulsive event. The boundary clay unit on land, represented by a section in Raton Basin, New Mexico, consists of a lower white clay, which is apparently a fallout deposit, and an upper carbonaceous shale. Boundary sections elsewhere are similar to those sections. The sedimentology of the boundary sediment records the convulsive environmental changes at/after a terminal Cretaceous event.
Year of Publication: 1988
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Caravaca Spain; Cenozoic; Clastic rocks; Clastic sediments; Clay; Cretaceous; DSDP Site 465; DSDP Site 524; Deep Sea Drilling Project; Denmark; Europe; Genesis; Gubbio Italy; IPOD; Iberian Peninsula; Italy; Leg 62; Leg 73; Lithostratigraphy; Marl; Mesozoic; Murcia Spain; New Mexico; Pacific Ocean; Paleocene; Paleogene; Perugia Italy; Petriccio; Raton Basin; Scandinavia; Sedimentary rocks; Sediments; Shale; Southern Europe; Spain; Stevns Klint; Stratigraphic boundary; Stratigraphy; Tertiary; Umbria Italy; United States; Upper Cretaceous; Western Europe
Coordinates: N334914 N334914 E1785508 E1785508
S292904 S292902 W0023044 W0023045
Record ID: 1989062146
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