Ramgarh crater

The Ramgarh Crater as seen from an aeroplane

Ramgarh crater is a 4 km wide potential meteor crater located near Ramgarh village, Mangrol, Baran district,[1] Rajasthan, India. If confirmed, its size would be between the two confirmed Indian craters, Dhala (14 km) and Lonar (1.8 km).[2][3][4] Several glass resembling rock samples have been collected and being investigated upon. Spherules collected contain very high percentage of iron and also very high ratios of Ni, Co etc. and these high ratios suggest meteorite strike or terrestrial rocks and is in Kota plateau.[2]

Studies

The crater is yet to be fully investigated in a systematic way.[2] It was first visited in 1869 by Mallet of Geological Survey of India. Later studies include by those of Coulson (1927–28), Sharma and Singh and Jaganathan and Rao (1969–70), Crowford (1972), Rakshit (1973), Ramaswamy (1981), Vimal Kumar Reddy(1984) etc.[1]

Appearance and present status

The crater is visible from a distance of 40 to 50 km, as it is located on a circular hill of about 400 mts high. The structure has a diameter of 3.2 km and forms a part of drainage of small river named Parvathi river.[1] It was called in different names like Ramgarh structure, Ramgarh Dome, Ramgarh astrobleme etc.[1] A rootless mass of sheared sandstone found near Bandewara temple in the crater indicates a fall back material.[1]

References

  1. 1 2 3 4 5 GSI. "The curious ring structure of Ramgarh in Vindhyas of Rajastan". Geological Survey of India. Geological Survey of India. Retrieved 27 July 2015.
  2. 1 2 3 Misra, S; G. Lashkari; D. Panda; A. Dube; M. S. Sisodia; H. E. Newsom; D. Sengupta (2008). "Geochemical Evidence for the Meteorite Impact Origin of Ramgarh Structure, India" (PDF). Lunar and Planetary Science XXXIX. Houston, Texas: Lunar and Planetary Institute. Retrieved 2009-08-25.
  3. ↑ Misra, S; A. Dube; P. K. Srivastava; H. E. Newsom (2008). "Time of Formation of Ramgarh Crater, India - Constraints from Geological Structures" (PDF). Lunar and Planetary Science XXXIX. Houston, Texas: Lunar and Planetary Institute. Retrieved 2009-08-25.
  4. ↑ Sisodia, M.S; G. Lashkari; N.Bhandari (2006). "Impact Origin Of the Ramgarh Structure, Rajasthan : Some New Evidences". Journal Geological Society of India vol 67 pp 423-431. Retrieved 2011-07-06.

Coordinates: 25°20′16″N 76°37′29″E / 25.33778°N 76.62472°E / 25.33778; 76.62472 (Ramgarh)


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