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The Kentland structure, also known as the Kentland crater or the Kentland disturbed area, is an impact structure located near the town of Kentland in Newton County, Indiana, United States. It was discovered about 1880 when two farmers began to quarry crushed rock there. The presence of shatter cones and deformed bedrock led geologists to conclude by the late 1960s that the Kentland structure is a deeply eroded impact structure, rather than volcanic in origin. Deformation at the site is so great that vertical contacts between normally horizontal rock formations of different ages are common.

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  • Der Kentland-Krater ist ein Impaktkrater, der im US-amerikanischen Bundesstaat Indiana vor mehr als 97 Millionen Jahren durch einen Meteoriten verursacht wurde. (de)
  • The Kentland structure, also known as the Kentland crater or the Kentland disturbed area, is an impact structure located near the town of Kentland in Newton County, Indiana, United States. It was discovered about 1880 when two farmers began to quarry crushed rock there. The presence of shatter cones and deformed bedrock led geologists to conclude by the late 1960s that the Kentland structure is a deeply eroded impact structure, rather than volcanic in origin. Deformation at the site is so great that vertical contacts between normally horizontal rock formations of different ages are common. The structure itself is a circular dome, about 7.24 km (4.50 mi) in diameter, deeply eroded and buried in glacial debris. Its age is estimated to be less than 97 million years (Cretaceous or younger). The Shakopee dolomite at the center of the structure is about 450 million years old (Ordovician period) and is uplifted about 2,000 feet higher than the level of the same rock in the surrounding area. The entire disturbed area is about 13 km (8.1 mi) in diameter. The estimated age is in dispute. * ‘"97 MYA‘" Late Cretaceous Period of the Mesozoic Era * ‘"300 MYA‘= Bzhelian or Late Pennsylvanian Epoch (Carboniferous Period) of the Paleozoic Era This impact structure was studied in 1978. John Weber and his associates presented fission track dating of apatite from this impact structure. Coesite and shatter cones are found in the uplift near its center. The impact structure is exposed to the surface, resulting in erosion. It is currently being worked as a quarry. (en)
  • Le cratère de Kentland est un cratère d'impact météoritique dont le centre est situé à 4 km à l'est de la ville de Kentland dans le comté de Newton en Indiana, au sud du lac Michigan. La structure, non visible depuis la surface, a été découverte en 1880. Son diamètre extérieur est de 13 km et son diamètre intérieur est d'environ 6,2 km. (fr)
  • Kentland – krater uderzeniowy w stanie Indiana, w USA. Większa część krateru jest pogrzebana pod osadami, niemal wszystkie skały krateru widoczne obecnie na powierzchni ziemi zostały odsłonięte wskutek działalności kopalni. Krater ma średnicę 12 km, powstał nie dawniej niż 97 milionów lat temu w późnej kredzie, w skałach osadowych. Podłoże skalne tworzą osady górnego dewonu i missisipu, które na tym terenie leżą poziomo, przez co zaburzona przez impakt struktura krateru jest dodatkowo uwidoczniona. W obrębie wyniesienia centralnego znajdują się dobrze wykształcone stożki zderzeniowe. (pl)
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  • Der Kentland-Krater ist ein Impaktkrater, der im US-amerikanischen Bundesstaat Indiana vor mehr als 97 Millionen Jahren durch einen Meteoriten verursacht wurde. (de)
  • Le cratère de Kentland est un cratère d'impact météoritique dont le centre est situé à 4 km à l'est de la ville de Kentland dans le comté de Newton en Indiana, au sud du lac Michigan. La structure, non visible depuis la surface, a été découverte en 1880. Son diamètre extérieur est de 13 km et son diamètre intérieur est d'environ 6,2 km. (fr)
  • Kentland – krater uderzeniowy w stanie Indiana, w USA. Większa część krateru jest pogrzebana pod osadami, niemal wszystkie skały krateru widoczne obecnie na powierzchni ziemi zostały odsłonięte wskutek działalności kopalni. Krater ma średnicę 12 km, powstał nie dawniej niż 97 milionów lat temu w późnej kredzie, w skałach osadowych. Podłoże skalne tworzą osady górnego dewonu i missisipu, które na tym terenie leżą poziomo, przez co zaburzona przez impakt struktura krateru jest dodatkowo uwidoczniona. W obrębie wyniesienia centralnego znajdują się dobrze wykształcone stożki zderzeniowe. (pl)
  • The Kentland structure, also known as the Kentland crater or the Kentland disturbed area, is an impact structure located near the town of Kentland in Newton County, Indiana, United States. It was discovered about 1880 when two farmers began to quarry crushed rock there. The presence of shatter cones and deformed bedrock led geologists to conclude by the late 1960s that the Kentland structure is a deeply eroded impact structure, rather than volcanic in origin. Deformation at the site is so great that vertical contacts between normally horizontal rock formations of different ages are common. (en)
rdfs:label
  • Kentland-Krater (de)
  • Cratère de Kentland (fr)
  • Kentland crater (en)
  • Kentland (pl)
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