• Publications
  • Influence
Stratigraphy and Isotope Ages of Lunar Geologic Units: Chronological Standard for the Inner Solar System
The absolute ages of cratered surfaces in the inner solar system, including Mars, are derived by extrapolation from the impact flux curve for the Moon which has been calibrated on the basis ofExpand
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Mass flux in the ancient Earth‐Moon system and benign implications for the origin of life on Earth
The origin of life on Earth is commonly considered to have been negatively affected by intense impacting in the Hadean, with the potential for the repeated evaporation and sterilization of any ocean.Expand
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The Time-Dependent Intense Bombardment of the Primordial Earth/Moon System
This invention relates to a unique, improved, inexpensive, one-piece garment or equipment hanger which can be securely attached to the diagonal rod or wire, of which the common chain link type fenceExpand
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Lunar samples, lunar accretion and the early bombardment of the Moon
Recent advances in lunar sample science and planetary accretion theories demand a new look at the bombardment history recorded by the Moon. Among lunar samples there are no impact melts dated olderExpand
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Cratering History and Lunar Chronology
The Moon is exceptional and important because it is the only planetary body besides the Earth for which we have both a detailed stratigraphic history and datable rock samples that can be related toExpand
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Heavy Bombardment on the Earth at ~3.85 Ga: The Search for Petrographic and Geochemical Evidence
The Moon experienced an interval of intense bombardment peaking at -3.85 ± 0.05 Ga; subsequent mare plains as old as 3.7 or 3.8 Ga are preserved. It can be assumed that the early Earth must have beenExpand
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Argon-40/Argon-39 Age Spectra of Apollo 17 Highlands Breccia Samples by Laser Step Heating and the Age of the Serenitatis Basin
We have obtained high-resolution (21–63 steps) 40Ar/39Ar age spectra using a continuous laser system on 19 submilligram samples of melt rocks and clasts from Apollo 17 samples collected from theExpand
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Bombardment of the Hadean Earth: wholesome or deleterious?
  • G. Ryder
  • History, Medicine
  • Astrobiology
  • 2003
Graham Ryder died in January 2002 at the age of 53. He was a Staff Scientist at the Lunar and Planetary Science Institute in Houston, TX for most of his professional life, studying lunar petrologyExpand
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New links between the Chicxulub impact structure and the Cretaceous/Tertiary boundary
THE 200-km-diameter Chicxulub structure1–3 in northern Yucatan, Mexico has emerged as the prime candidate for the Cretaceous/Tertiary (K/T) boundary impact crater3–6. Concentric geophysical anomaliesExpand
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