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 41: Line 41:
 
=== Locality 3, Gordale Lane, at the base of Cawden Hill [SD 904 629] ===
 
=== Locality 3, Gordale Lane, at the base of Cawden Hill [SD 904 629] ===
  
View the 'reef' limestones on the southern flank of Cawden from a position just west of the bend in Gordale Lane. These carbonate build-ups, first recognized by R. H. Tiddeman, were largely constructed by organisms, and had depositional topographies of over 100 m. They are not, however, analogous to present-day coral-algal framework reefs. Three principal subfacies make up the build-ups ''bank, flank, ''and ''framework ''([[:File:YGS_YORKROCK_FIG_02_03.jpg|Figure 2.3]]). The bank is the poorly bedded core of the build-ups, while the flank facies formed the basin-facing palaeoslope, with depositional dips up to 35°. These subfacies contained a diverse and locally prolific biota dominated by '''brachiopods''', '''molluscs''', '''crinoids''', '''bryozoans''' and '''corals'''. The lower southern slope of Cawden here consists largely of flank beds dipping southwards at about 30° (clearly seen in the old quarries just beyond the wall), whilst the middle slopes consist of flank and bank facies. The small raised feature visible at the top of the hill is a good example of the stromatolitic framework facies, which developed locally in the shallowest-water setting of the build-up. The present-day topography on this slope is a reflection of the original profile of the build-up. Proceed to Malham village.
+
View the 'reef' limestones on the southern flank of Cawden from a position just west of the bend in Gordale Lane. These carbonate build-ups, first recognized by R. H. Tiddeman, were largely constructed by organisms, and had depositional topographies of over 100 m. They are not, however, analogous to present-day coral-algal framework reefs. Three principal subfacies make up the build-ups ''bank, flank, ''and ''framework ''([[:File:YGS_YORKROCK_FIG_02_03.jpg|Figure 2.3]]). The bank is the poorly bedded core of the build-ups, while the flank facies formed the basin-facing palaeoslope, with depositional dips up to 35°. These subfacies contained a diverse and locally prolific biota dominated by brachiopods, molluscs, crinoids, bryozoans and corals. The lower southern slope of Cawden here consists largely of flank beds dipping southwards at about 300 (clearly seen in the old quarries just beyond the wall), whilst the middle slopes consist of flank and bank facies. The small raised feature visible at the top of the hill is a good example of the stromatolitic framework facies, which developed locally in the shallowest-water setting of the build-up. The present-day topography on this slope is a reflection of the original profile of the build-up. Proceed to Malham village.
  
 
=== Locality 4 (optional), Malham Cove viewpoint [SD 897 633] ===
 
=== Locality 4 (optional), Malham Cove viewpoint [SD 897 633] ===
  
Follow the road northwards through the village to the footpath gate leading to the Cove. View the geology of this spectacular section from here, or if you have the time and the energy inspect it at closer range. Malham Beck resurges from the base of the cliff. This stream receives only a small component of water from the Malham Tarn 'Water Sinks', a sink at the head of the Watlowes dry valley (which terminates at the Cove), taking the overflow water from Malham Tarn. This water source, although seemingly the obvious candidate for the Cove resurgence, does in fact flow at a deeper level and rises south of Malham as the Airehead Springs. The majority of the Malham Beck resurgence is derived from the 'Smelt Mill Sink' 1.2 km west of the Water Sinks.
+
Follow the road northwards through the village to the footpath gate leading to the Cove. View the geology of this spectacular section from here, or if you have the time and the energy inspect it at closer range. Malham Beck resurges from the base of the cliff. This stream receives only a small component of water from the Malham Tarn 'Water Sinks', a sink at the head of the Watlowes dry valley (which terminates at the Cove), taking the overflow water from Malham Tarn. This water source, although seemingly the obvious candidate for the Cove resurgence, does in fact flow at a deeper level and rises south of Malham as the Airehead Springs. The majority of the Malham Beck resurgence is derived from the 'Smelt Mill Sink' 1.2 km west of the Water Sinks.
  
Malham Cove is the stratotype of the Cove Limestone which is here 72 m thick. The top of the member is the bedding plane some 5 m above a prominent overhang (compare Gordale Scar). The basal 10 m of the overlying Gordale Limestone forms the remainder of the Cove cliff, with a well-developed limestone pavement on its top. A small '''inlier''' of dark grey grainstone referable to the Kilnsey Limestone Member of the Kilnsey Formation occurs in the valley bottom below the Cove. While you are at this locality, take the opportunity to view the western side of Cawden, where bedded Malham Formation in the hanging wall of the MCF can be seen dipping northwards at about 20°. Return to Malham.
+
Malham Cove is the stratotype of the Cove Limestone which is here 72 m thick. The top of the member is the bedding plane some 5 m above a prominent overhang (compare Gordale Scar). The basal i o m of the overlying Gordale Limestone forms the remainder of the Cove cliff, with a well-developed limestone pavement on its top. A small inlier of dark grey grainstone referable to the Kilnsey Limestone Member of the Kilnsey Formation occurs in the valley bottom below the Cove. While you are at this locality, take the opportunity to view the western side of Cawden, where bedded Malham Formation in the hanging wall of the MCF can be seen dipping northwards at about 20°. Return to Malham.
  
 
=== Locality 5, Burns Barn (Field Barns) [SD 893 632] ===
 
=== Locality 5, Burns Barn (Field Barns) [SD 893 632] ===

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>