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Found 92 matches
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  1. ... degrees north and south; of these bands, the southern hemispheric zone contains more gully features. Most surveys focused on gullies forming along crater walls; however, the Dao and Harmakhis Valles systems provide a unique opportunity to evaluate gully features with respect to latitude, elevation, ...
  2. ... of high concentrations of LCP are typically restricted to small outcrops in older, Noachian terrains. High olivine abundances have been found in crater floors in Lunae Planum, in crater rims in the southern highlands, and associated with volcanic rocks in and around Syrtis Major. Deposits with hydrated ...
  3. ... are penetrated by the EWDP boreholes south and southwest of the proposed repository. Ground water near Pleistocene-age tufa deposits in southern Crater Flat has δ87Sr values between +4.4 and +5.8, similar to those of the deposits. Samples from new boreholes in a small valley north of the Lathrop ...
  4. ... 611 North Pleasant Street, Amherst, MA 01331, amueller@geo.umass.edu, TRUSDELL, Frank A., Hawaiian Volcano Observatory, United States Geol Survey, 1 Crater Rim Drive, Hawaii Volcanoes National Park, HI 96718-0051, and RHODES, J. Michael, Geosciences, Univ of Massachusetts, 611 North Pleasant Street ...
  5. ... 68588-0340, dloope1@unl.edu 157-7 144 NATURAL DAMS AND FLOODS OF LEGEND AT MOUNT BAKER VOLCANO--EVIDENCE FROM VOLCANIC STRATIGRAPHY OF THE SHERMAN CRATER ERUPTIVE PERIOD (AD 1843 TO PRESENT): SCOTT, Kevin M., Cascade Volcano Observatory, US Geol Survey, 1300 SE Cardinal Court, Bldg 10, Suite 100, Vancouver ...
  6. ... displaced ice blocks kms across embedded in a matrix of disturbed ice, bands of newer ice, cryovolcanoes, domes and pits, and fault scarps. Impact craters pierce the crust, exposing older ice in crater walls, central peaks, overturned ice, and ejecta. Opportune sites for studying habitats and their ...
  7. ... 611 North Pleasant Street, Amherst, MA 01331, amueller@geo.umass.edu, TRUSDELL, Frank A., Hawaiian Volcano Observatory, United States Geol Survey, 1 Crater Rim Drive, Hawaii Volcanoes National Park, HI 96718-0051, and RHODES, J. Michael, Geosciences, Univ of Massachusetts, 611 North Pleasant Street ...
  8. ... Resources, Mineral House, 100 Plain Street, East Perth 6004, kath.grey@doir.wa.gov.au The c.580 (Ediacaran) Acraman impact event formed a collapse crater ~90 km in diameter, scattered ejecta across 1000 km of Australia, and may have produced a dust cloud large enough to block out sunlight and cause ...
  9. ... using HRSC-SRC data, and will discuss future imaging plans throughout the remainder of Mars Express’ two Earth-year nominal mission. For example, crater counts on HRSC images suggest that the caldera floors of Mars’ large shield volcanoes are as young as 100-400 million years in age, indicative of geologically ...
  10. ... -type impactite units of drill core Yaxcopoil-1 (Yax-1), Chicxulub impact structure, Mexico [1] and 39 zircons from impact melt rocks of the Popigai crater, Siberia [2] were analyzed in thin section. The full range of progressive shock metamorphic features are developed in the Yax-1 zircons: 57 grains ...

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