Multiple impact event in the paleozoic

Collision with a string of comets or asteroids?

Research output: Contribution to journalArticle

Abstract

Eight circular geologic structures ranging from -3 to 17 km in diameter, showing evidence of outward-directed radial deformation and intensive brecciation, lie within a linear swath -15 km wide along a straight line stretching -700 km across the United States from southern Illinois through Missouri to eastern Kansas. Based on their similar geological characteristics and the presence of diagnostic and/or probable evidence of shock, these structures, once classified as 'cryptovolcanic' of 'cryptoexplosion' structures, are more confidently ascribed to hypervelocity impact. No other similar occurrence of aligned features is known, and we calculate the probability of a chance alignment to be <10-9. The unusual alignment suggests that the features are coeval and related to a multiple impact event, with a best-constrained late Mississippian-early Pennsylvanian (-330-310 Myr) age. Calculations suggest that the proposed impact-crater chain is unlikely to have been formed by an incoming impactor disrupted by terrestrial or lunar tidal effects, and may have been the result of a string of asteroidal or cometary objects produced by breakup within the inner Solar System.

Original languageEnglish (US)
Pages (from-to)49-52
Number of pages4
JournalGeophysical Research Letters
Volume23
Issue number1
StatePublished - Jan 1 1996

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asteroids
comets
asteroid
comet
strings
Paleozoic
collision
alignment
hypervelocity impact
impactors
collisions
Pennsylvanian
craters
solar system
crater
shock
occurrences
impactor
calculation
effect

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Multiple impact event in the paleozoic : Collision with a string of comets or asteroids? / Rampino, Michael R.; Volk, Tyler.

In: Geophysical Research Letters, Vol. 23, No. 1, 01.01.1996, p. 49-52.

Research output: Contribution to journalArticle

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