Volcanic Rocks and Features

Metadata Updated: October 13, 2020

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License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Date September 27, 2018
Metadata Created Date October 13, 2020
Metadata Updated Date October 13, 2020
Reference Date(s) 1994 (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from NGDC MGG Hazard Photos

Graphic Preview

Contraction during cooling of thick, extrusive basaltic lava flows causes cracks perpendicular to the cooling surface, which form the polygonal columns of the Devil's Postpile in California. The columns average about 46 cm across. In thic,k slowly cooled flows, the joints normal to the flow surface tend to develop in three directions at roughly 60 degrees to each other and form multi-sided blocks that are cut off by the joints parallel to the flow surface. Jointing of this sort may attain a high degree of regularity. The horizontal joints divide the columns into a series of segments. Such columnar jointing is found in all types of lava flows, including ash flows. It is also conspicuous in dikes and other intrusions.

Additional Metadata

Resource Type Dataset
Metadata Date September 27, 2018
Metadata Created Date October 13, 2020
Metadata Updated Date October 13, 2020
Reference Date(s) 1994 (publication)
Responsible Party NOAA National Centers for Environmental Information (Point of Contact)
Contact Email
Access Constraints Access Constraints: None Use Constraints: None Distribution Liability: While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
Bbox East Long 170.58
Bbox North Lat 64.17
Bbox South Lat -45.06
Bbox West Long -157.49
Coupled Resource
Frequency Of Update notPlanned
Graphic Preview Description Contraction during cooling of thick, extrusive basaltic lava flows causes cracks perpendicular to the cooling surface, which form the polygonal columns of the Devil's Postpile in California. The columns average about 46 cm across. In thic,k slowly cooled flows, the joints normal to the flow surface tend to develop in three directions at roughly 60 degrees to each other and form multi-sided blocks that are cut off by the joints parallel to the flow surface. Jointing of this sort may attain a high degree of regularity. The horizontal joints divide the columns into a series of segments. Such columnar jointing is found in all types of lava flows, including ash flows. It is also conspicuous in dikes and other intrusions.
Graphic Preview File https://www.ngdc.noaa.gov/hazard/icons/small_res/29/29_585.jpg
Graphic Preview Type JPEG
Guid gov.noaa.ngdc.mgg.photos:G01222
Harvest Object Id 84c4ef25-be61-4ebe-a1af-321d95f4b99a
Harvest Source Id 8269c840-5a0f-4da4-afd8-7c0d67da19c0
Harvest Source Title NGDC MGG Hazard Photos
Licence
Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True

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