File:The Quarterly journal of the Geological Society of London (13937262342).jpg
Original file (2,104 × 1,152 pixels, file size: 503 KB, MIME type: image/jpeg)
Captions
Summary
[edit]DescriptionThe Quarterly journal of the Geological Society of London (13937262342).jpg |
ON THE NORTHERN SLOPES OP CADER IDRIS. 425 or more across. In thoir cracked and scoriaceous interior calcite has developed freely, so much so as to suggest at first the presence of ejected limestone blocks. After boiling this crystalline alteration- product in hydrochloric acid, the residue yields little of interest, quartz and a few brown flakes of mica being the only identifiable minerals. Prof. Ramsay * has commented on the difficulty of distinguishing between the compacter intrusive sheets, themselves often scoriaceous, and the soft grey-green ash-beds. On the broken slopes between Llyn-y-Gafr and Llyn-y-Gader the cleavage of the district has affected some of the igneous layers, while every crack and hollow is filled with secondary calcite. Hence the rocks afford, when considered in the laboratory, excellent hand-specimens of " Schalstein ; " but to designate them by such a name is to admit that we are baffled in the field. Some of the undoubted ash-beds, even when soft and calcareous, are divided by jointing into spike-like columns ; while the compacter and more metamorphosed ashes at the base of the cliff of Mynydd Fig. 2. — Beds beneath the Eurite on Mynydd Moel. 1. Black Slates, with cleavage practically coincident with bedding. 2. Altered flinty slates, with well-marked bedding. 3. Greenish softer laver. 4. Bedded Ash, altered and jointed into columns, 5. The Massive Eurite. Moel imitate closely the columnar eurite of the wall (fig. 2). The fine layers of the bedding, however, frequently weather out, and give a clue to the origin of the rock ; while microscopic examination removes many of the difficulties presented by the porcellaneous varieties f . Memoirs of theGeol. Surv. of Gt. Britain, vol. iii. 2nd edition, p. 31. t Mr. J. Clifton Ward discussed the microscopic characters of somewhat similar ashes in his paper on the " Structure of Ancient and Modern Volcanic Rocks," Quart. Journ. Geol. Soc. vol. xxxi. (1875) p.403. |
||
Date | |||
Source | https://www.flickr.com/photos/biodivlibrary/13937262342 | ||
Author | Geological Society of London | ||
Full title InfoField | The Quarterly journal of the Geological Society of London. | ||
Page ID InfoField | 36940244 | ||
Item ID InfoField | 113696 (Find related Wikimedia Commons images) | ||
Title ID InfoField | 51125 | ||
Page numbers InfoField | Page 423 | ||
Names InfoField | NameFound:Idris NameConfirmed:Idris EOLID:2720707 NameBankID:4204717 | ||
BHL Page URL InfoField | https://www.biodiversitylibrary.org/page/36940244 | ||
Page type InfoField | Text | ||
Flickr sets InfoField |
|
||
Flickr tags InfoField |
|
||
Flickr posted date InfoField | 21 April 2014 | ||
Credit InfoField |
|
The categories of this image need checking. You can do so here.
|
Licensing
[edit]- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by BioDivLibrary at https://flickr.com/photos/61021753@N02/13937262342. It was reviewed on 26 August 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
26 August 2015
This image is in the public domain because it is a mere mechanical scan or photocopy of a public domain original, or – from the available evidence – is so similar to such a scan or photocopy that no copyright protection can be expected to arise. The original itself is in the public domain for the following reason:
This tag is designed for use where there may be a need to assert that any enhancements (eg brightness, contrast, colour-matching, sharpening) are in themselves insufficiently creative to generate a new copyright. It can be used where it is unknown whether any enhancements have been made, as well as when the enhancements are clear but insufficient. For known raw unenhanced scans you can use an appropriate {{PD-old}} tag instead. For usage, see Commons:When to use the PD-scan tag. Note: This tag applies to scans and photocopies only. For photographs of public domain originals taken from afar, {{PD-Art}} may be applicable. See Commons:When to use the PD-Art tag. |
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 05:54, 26 August 2015 | 2,104 × 1,152 (503 KB) | FlickreviewR 2 (talk | contribs) | Replacing image by its original image from Flickr | |
05:43, 26 August 2015 | 1,166 × 2,104 (506 KB) | Fæ (talk | contribs) | == {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13937262342 | description = ON THE NORTHERN SLOPES OP CADER IDRIS. 425 <br>... |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
- Biodiversity Heritage Library maintenance missing collection
- Files from the Biodiversity Heritage Library
- Media needing category review as of 26 August 2015
- CC-BY-2.0
- Flickr images reviewed by FlickreviewR
- CC-PD-Mark
- PD-old-70-expired
- PD-scan (PD-old-70-expired)
- Photos uploaded from Flickr by Fæ using a script