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tillite

[til-ahyt] /ˈtɪl aɪt/
noun
1.
a rock composed of consolidated till.
Origin
1915-1920
1915-20; till4 + -ite1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for tillite
  • Remnants of early mountain glacial deposits partly cemented to tillite, lie on top of the number one terrace remnants.
Encyclopedia Article for tillite

sedimentary rock that consists of consolidated masses of unweathered blocks (large, angular, detached rock bodies) and glacial till (unsorted and unstratified rock material deposited by glacial ice) in a rock flour (matrix or paste of unweathered rock). The matrix, which comprises a large percentage of the rock, usually is dark gray to greenish black in colour and consists of angular quartz and feldspar grains and rock fragments in a very fine-grained paste. The widespread tillites in the geologic record provide evidence of former intense and widespread glaciation; Recent tillites (less than 10,000 years old) can be directly connected with glaciation, and Pleistocene tillites (10,000 to 2,500,000 years old) can be convincingly related to glaciation, but many earlier till-like bodies cannot. Only tillites formed from the till deposited by continental ice sheets have a good chance of being preserved in the geologic record

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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