Editing Cheviot — early Devonian volcanic rocks, granite and basement - an excursion

Jump to navigation Jump to search

Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.

The edit can be undone. Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.

This page supports semantic in-text annotations (e.g. "[[Is specified as::World Heritage Site]]") to build structured and queryable content provided by Semantic MediaWiki. For a comprehensive description on how to use annotations or the #ask parser function, please have a look at the getting started, in-text annotation, or inline queries help pages.

Latest revision Your text
Line 45: Line 45:
 
Park on a grassy area just before the bridge and follow the footpath along the north side of Carey Burn. In the first 300 m three alluvial terraces are clearly seen on the north side. At the first stile the small valley to the north cuts through till plastered against the lowest slopes of the hillside.
 
Park on a grassy area just before the bridge and follow the footpath along the north side of Carey Burn. In the first 300 m three alluvial terraces are clearly seen on the north side. At the first stile the small valley to the north cuts through till plastered against the lowest slopes of the hillside.
  
==== Locality 2 [NT 9698 2508] ====
+
==== Locality 2 [NT 9698 2508] about 150 m upstream of the island in Carey Burn is the first exposure of solid rock ====
  
About 150 m upstream of the island in Carey Burn is the first exposure of solid rock. It is a dark purplish grey, splintery '''porphyritic''' andesite with small '''phenocrysts''' of white '''feldspar''' and dark pyroxene. The valley narrows just beyond here. There is plenty of rock on both sides, but the main rock types can be seen in the numerous screes along the path. Besides the dark purplish grey andesite, there is a common variety with big white feldspar phenocrysts (up to 1 cm long) and smaller pyroxene phenocrysts in a fine-grained reddish buff groundmass. The burn crosses the metamorphic aureole of the Cheviot granite and many of the rocks show signs of metamorphism. Feldspar phenocrysts are replaced by yellow '''epidote''' and the pyroxenes by pale green '''tremolite''' or dark green '''chlorite'''. There are often small crystals of black, flaky '''biotite'''. Spots of yellow epidote and patches of green chlorite occur in the groundmass.
+
It is a dark purplish grey, splintery '''porphyritic''' andesite with small '''phenocrysts''' of white '''feldspar''' and dark pyroxene. The valley narrows just beyond here. There is plenty of rock on both sides, but the main rock types can be seen in the numerous screes along the path. Besides the dark purplish grey andesite, there is a common variety with big white feldspar phenocrysts (up to 1 cm long) and smaller pyroxene phenocrysts in a fine-grained reddish buff groundmass. The burn crosses the metamorphic aureole of the Cheviot granite and many of the rocks show signs of metamorphism. Feldspar phenocrysts are replaced by yellow '''epidote''' and the pyroxenes by pale green '''tremolite''' or dark green '''chlorite'''. There are often small crystals of black, flaky '''biotite'''. Spots of yellow epidote and patches of green chlorite occur in the groundmass.
  
 
==== Locality 3 [NT 9638 2553] is a waterfall in the burn ====
 
==== Locality 3 [NT 9638 2553] is a waterfall in the burn ====

Please note that all contributions to Earthwise may be edited, altered, or removed by other contributors. If you do not want your writing to be edited mercilessly, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource (see Earthwise:Copyrights for details). Do not submit copyrighted work without permission!

Cancel Editing help (opens in new window)

  [] · [[]] · [[|]] · {{}} · · “” ‘’ «» ‹› „“ ‚‘ · ~ | °   · ± × ÷ ² ³ ½ · §
[[Category:]] · [[:File:]] · <code></code> · <syntaxhighlight></syntaxhighlight> · <includeonly></includeonly> · <noinclude></noinclude> · #REDIRECT[[]] · <translate></translate> · <languages/> · ==References== · {{reflist}} · ==Footnote== · {{reflist|group=note}} · <ref group=note> · __notoc__ · {{DEFAULTSORT:}} <div class="someclass noprint"></div> {{clear}} <br>