Editing Craven Fault Zone — Malham to Settle - 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 51: Line 51:
 
=== Locality 5, Burns Barn (Field Barns) [SD 893 632] ===
 
=== Locality 5, Burns Barn (Field Barns) [SD 893 632] ===
  
Take the footpath from Malham heading to Field Barns and Pikedaw. The footpath crosses 'reef' limestone belonging to the Malham Formation. Small exposures in this tract show shelly limestones referable to the ''bank ''subfacies. The contact of the Bowland Shales on the reef limestones occurs 100 m west of Field Barns, and is defined by the rising ground east of Sell Gill. Although both the limestone and Bowland Shales are covered by a veneer of '''till''', the ill-drained ground associated with the shales is conspicuous. Proceed westwards, up Pikedaw Gill, picking up the line of the MCF defined by the Malham Formation escarpment of Pikedaw to the north. Review the course of the fault eastwards from Malham.
+
Take the footpath from Malham heading to Field Barns and Pikedaw. The footpath crosses 'reef' limestone belonging to the Malham Formation. Small exposures in this tract show shelly limestones referable to the ''bank ''subfacies. The contact of the Bowland Shales on the reef limestones occurs loo m west of Field Barns, and is defined by the rising ground east of Sell Gill. Although both the limestone and Bowland Shales are covered by a veneer of till, the ill-drained ground associated with the shales is conspicuous. Proceed westwards, up Pikedaw Gill, picking up the line of the MCF defined by the Malham Formation escarpment of Pikedaw to the north. Review the course of the fault eastwards from Malham.
  
 
=== Locality 6, Pikedaw Gill [SD 882 636] ===
 
=== Locality 6, Pikedaw Gill [SD 882 636] ===
  
The stream runs close to the margin of an extensive landslip, involving the Namurian formations to the south. Stop at the portal of the Pikedaw lead level beside the footpath. The portal has a stone-built arch with a keystone dated 1872, and is one of several entrances to the mine workings exploiting '''galena'''-bearing '''veins''' of the Pikedaw area. Most of the lead veins trend northwest-southeast, coincident with the general fault trend between the NCF and MCF. The Pikedaw area has a long history of mining probably dating from the 17th century, with copper, zinc and lead minerals extracted.
+
The stream runs close to the margin of an extensive landslip, involving the Namurian formations to the south. Stop at the portal of the Pikedaw lead level beside the footpath. The portal has a stone-built arch with a keystone dated 1872, and is one of several entrances to the mine workings exploiting galena-bearing veins of the Pikedaw area. Most of the lead veins trend northwest-southeast, coincident with the general fault trend between the NCF and MCF. The Pikedaw area has a long history of mining probably dating from the 17th century, with copper, zinc and lead minerals extracted.
  
 
=== Locality 7, Pikedaw [SD 881 638] ===
 
=== Locality 7, Pikedaw [SD 881 638] ===
  
Follow the footpath 200 m northeast of Locality 6 to limestone exposures bordering the footpath. Here the Gordale Limestone, close to the contact of the Hawes Limestone, is partially silicified. Brown '''quartz'''-rock has replaced limestone in irregular zones which stand proud of the limestone surface due to their greater resistance to weathering. Analogous silicified limestone forms northwest-trending replacement zones within the Hawes Limestone just to the north. These replacement bodies, clearly visible east of the footpath, weather as raised ribs carrying a more acid-tolerant flora than the limestone. The landslip on the eastern slopes of Kirkby Fell is well seen from here. The failure occurred in two episodes, each postdating the Devensian glaciation, with the Pendle Grit Formation and the lower leaf of the overlying Grassington Grit Formation collapsing to leave jumbled debris extending downslope onto the Bowland Shales.
+
Follow the footpath 200 m northeast of Locality 6 to limestone exposures bordering the footpath. Here the Gordale Limestone, close to the contact of the Hawes Limestone, is partially silicified. Brown quartz-rock has replaced limestone in irregular zones which stand proud of the limestone surface due to their greater resistance to weathering. Analogous silicified limestone forms northwest-trending replacement zones within the Hawes Limestone just to the north. These replacement bodies, clearly visible east of the footpath, weather as raised ribs carrying a more acid-tolerant flora than the limestone. The landslip on the eastern slopes of Kirkby Fell is well seen from here. The failure occurred in two episodes, each postdating the Devensian glaciation, with the Pendle Grit Formation and the lower leaf of the overlying Grassington Grit Formation collapsing to leave jumbled debris extending downslope onto the Bowland Shales.
  
 
=== Locality 8, Calamine Mine 'New Shaft' [SD 876 640] ===
 
=== Locality 8, Calamine Mine 'New Shaft' [SD 876 640] ===

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>