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No. 3: April 1978

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Strange Hillocks And Ridges On Mars

On the northwestern flanks of the huge Martian volcano Arsia Mons are countless hillocks of undetermined origin. Mostly 100 to 500 meters in diameter, the hillocks cover the edge of the volcano flank. In addition, the outer edge of the flank is surrounded by dozens of parallel ridges that stretch lengthwise for hundreds of kilometers, A peculiar feature of the ridges is that they have not been disturbed by craters or flow features; there are not even any variations in surface brightness. One explanation suggests that both hillocks and ridges were created in a huge landslide.

(Anonymous; "Strange Hillocks and Ridges on Mars," Science News, 113:43, 1978.)

Comment. The hillocks resemble the much smaller terrestrial Mima Mounds.

Reference. Martian topographical anomalies are cataloged in Section AME in The Moon and the Planets. Further information on this book is located here.

From Science Frontiers #3, April 1978. 1978-2000 William R. Corliss

Science Frontiers Sourcebook Project Reviewed in:


  • "A sourcebook of unexplained phenomena is therefore a valuable addition to a collection of scientific literature. William R. Corliss has provided this in the past with his source books of scientific anomalies in several subjects, and now he has provided it for astronomy. He has done an excellent job of collecting and editing a large amount of material, taken in part from scientific journals and in part from scientific reporting in the popular or semi-scientific press." -- "The Mysterious Universe: A Handbook of Astronomical Anomalies", reviwed by Thomas Gold, Cornell University, in Icarus, vol.41, 1980

  • "An interesting, systematic presentation of unusual weather [..] This book is recommended for a general audience" --"Corliss, William R., Tornados, Dark Days, Anomalous Precipitation, and Related Weather Phenomena, Sourcebook Project, 1983.", revieweed in Choice, September 1983
  • "..the science is necessarily somewhat speculative, but Corliss's symthesis is based on reputable sources." -- "Corliss, William R. (Compiler). Lightning, Auroras, Nocturnal Lights, and Related Luminous Phenomena" reviwed by Joseph M. Moran, Univ. of Wisconsin in Science Books and Films, Sep/Oct 1983

  • "Before opening the book, I set certain standards that a volume which treads into dangerous grounds grounds like this must meet. The author scrupulously met, or even exceeded those standards. Each phenomenon is exhaustively documented, with references to scientific journals [..] and extensive quotations" -- "Book Review: The moon and planets: a catalog of astronomical anomalies", The Sourcebook Project, 1985., Corliss, W. R., Journal of the Royal Astronomical Society of Canada, Vol. 81, no. 1 (1987), p. 24., 02/1987