Editing St Fergus (Annachie) - locality, Cainozoic of north-east Scotland

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 29: Line 29:
 
Most of the molluscan fauna in the St Fergus Silt Formation would not be out of place in a glaciomarine setting and the adjusted radiocarbon ages between 14 ka and 15 ka BP on shells of ''Hiatella arctica ''fall within a period when high-arctic faunas lived in the northern North Sea (Sejrup et al., 1994; Peacock, 1995). This poses a problem, however, because raised beaches and raised marine deposits generally have been assumed to be absent in peripheral areas of eastern Scotland on theoretical grounds that the contemporary sea level was below OD (Sissons, 1976; Lambeck, 1995). Much more ice must have been present in the vicinity, both onshore and offshore in the North Sea basin. The isolated occurrence of the St Fergus Silt Formation may be explained if, apart from the St Fergus area, much of the coastline of north-eastern Buchan east of Troup Head and north of Aberdeen was ice covered until relative sea level had fallen close to or below its present level.
 
Most of the molluscan fauna in the St Fergus Silt Formation would not be out of place in a glaciomarine setting and the adjusted radiocarbon ages between 14 ka and 15 ka BP on shells of ''Hiatella arctica ''fall within a period when high-arctic faunas lived in the northern North Sea (Sejrup et al., 1994; Peacock, 1995). This poses a problem, however, because raised beaches and raised marine deposits generally have been assumed to be absent in peripheral areas of eastern Scotland on theoretical grounds that the contemporary sea level was below OD (Sissons, 1976; Lambeck, 1995). Much more ice must have been present in the vicinity, both onshore and offshore in the North Sea basin. The isolated occurrence of the St Fergus Silt Formation may be explained if, apart from the St Fergus area, much of the coastline of north-eastern Buchan east of Troup Head and north of Aberdeen was ice covered until relative sea level had fallen close to or below its present level.
  
The surface level of the St Fergus Silt Formation and the height of the supposed raised beach backing it, imply a marine transgression to a mean sea level of at least 12 m above OD and therefore considerable glacio-isostatic depression at about 15 ka BP (Peacock, 1997). This is taken as supporting evidence for total ice cover in Buchan during the Main Late Devensian glaciation (Hall and Bent, 1990) and for coalescence of the Scottish and Scandinavian ice sheets during at least an early phase of that glaciation (Sejrup et al., 2000) ([[Media:P915288.png|P915288]], [[Media:P915291.png|P915291]]).
+
The surface level of the St Fergus Silt Formation and the height of the supposed raised beach backing it, imply a marine transgression to a mean sea level of at least 12 m above OD and therefore considerable glacio-isostatic depression at about 15 ka BP (Peacock, 1997). This is taken as supporting evidence for total ice cover in Buchan during the Main Late Devensian glaciation (Hall and Bent, 1990) and for coalescence of the Scottish and Scandinavian ice sheets during at least an early phase of that glaciation (Sejrup et al., 2000) (P915288, P915291).
  
 
== References ==
 
== References ==

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>

Template used on this page: