NTRS - NASA Technical Reports Server

Back to Results
Late Eocene rings around the earthThe suggestion of O'Keefe (1980) that the terminal Eocene event was caused by rings of tektite material encircling the earth is discussed. It is argued that the assumption that the tektites are of lunar volcanic origin is unwarranted and contrary to existing data, including the lack of lunar rocks of suitable composition, the lack of lunar rocks of the correct age, the lack of evidence that the North American tektites fell throughout a sedimentary rock column of a few million years, and the nondetection of a tektite with a measurable cosmic ray exposure age. Alternatively, it is suggested that the terminal Eocene event may be associated with volcanic ash, air-fall tuff and bentonite in the late Eocene. O'Keefe replies that the hypothesis of the terrestrial origin of the tektites conflicts with the laws of physics, for example in the glass structure and shaping of the tektites. Furthermore, evidence is cited for lunar rocks of the proper major-element composition and ages, and it is noted that the proposed solar Poynting-Robertson effect would account for the particle fall distributions and cosmic ray ages.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
King, E. A. (Lunar and Planetary Institute Houston, Tex., United States)
Date Acquired
August 11, 2013
Publication Date
November 6, 1980
Publication Information
Publication: Nature
Volume: 288
Subject Category
Distribution Limits