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Impact and its revolutionary implications for geology

Ursula B. Marvin
Impact and its revolutionary implications for geology (in Global catastrophes in Earth history; an interdisciplinary conference on impacts, volcanism, and mass mortality, Virgil L. Sharpton (editor) and Peter D. Ward (editor))
Special Paper - Geological Society of America (1990) 247: 147-154

Abstract

Mainstream geology is founded upon uniformitarian concepts enunciated by James Hutton (1726-1797) and Charles Lyell (1797-1875), who argued that, during unlimited expanses of time, the Earth has undergone slow, ceaseless change by processes we can observe in operation. In their view, we cannot call on any powers that are not natural to the globe, admit of any action of which we do not know the principle, nor allege extraordinary events to explain a common appearance. A hypervelocity meteorite impact is an extraordinary event, originating from outside the Earth, and wreaking change instantaneously. Such a process violates every tenet of uniformitarianism. Largely for this reason, hypotheses of impact origin for craters on the Earth and the moon were vigorously opposed for the better part of the past century. Space-age research now has established beyond doubt the authenticity of impact as a geologic process, but an abundance of evidence exists that a wide chasm still persists between the views of impact specialists and those of terrestrial geologists. A full realization of the ramifications of impact processes may have been delayed by the advent of plate tectonics, which engulfed the geological community in the late 1960s. Revolutionary as it appeared at that time, plate tectonics, which is envisioned as involving gradual changes generated by forces internal to the globe, fully conforms with uniformitarian principles. In contrast, impact processes, which have recently been cited to account for cataclysmic events such as massive tsunami deposits, incinerating wildfires, and global extinctions, carry genuinely revolutionary implications that are fatal to the uniformitarian principle itself.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 247
Title: Impact and its revolutionary implications for geology
Title: Global catastrophes in Earth history; an interdisciplinary conference on impacts, volcanism, and mass mortality
Author(s): Marvin, Ursula B.
Author(s): Sharpton, Virgil L.editor
Author(s): Ward, Peter D.editor
Affiliation: Harvard-Smithson. Cent. Astrophys., Cambridge, MA, United States
Affiliation: Lunar and Planet. Inst., Houston, TX, United States
Pages: 147-154
Published: 1990
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Meeting name: Global catastrophes in Earth history; an interdisciplinary conference on impacts, volcanism, and mass mortality
Meeting location: Snowbird, UT, USA, United States
Meeting date: 19881020Oct. 20-23, 1988
References: 45
Accession Number: 1995-026143
Categories: Stratigraphy
Document Type: Serial Conference document
Bibliographic Level: Analytic
Secondary Affiliation: Univ. Wash., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199510
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