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Coniston - Ashgill


The Onny Trail - Caradoc


Abereiddy - Llanvirn


Hodgson How - Arenig

Ordovician

GEOGRAPHY AND CLIMATE: All land masses move south, Floods subside but return and cover more land at any other time, Extensive glaciation.

TERRESTRIAL ANIMAL LIFE: No life on land.

PLANT LIFE: Primitive algae and seaweeds.

SEA LIFE: Shelled invertebrates develop, Corals, Bryozoans, Brachiopods, Jawless armoured fishes, nautiliods, trilobites, echinoderms, Graptolites, Bivalves.

British Stratification Tables
Updated and correct from 2004 MYA=Million Years Ago from present

Ashgill
443 - 449 MYA
Hirnantian Coniston Limestone Formation Ashgill Shales Coniston Area
Troutbeck Coniston Area
White Limestone Coniston Area
Torver Member Coniston Area
High Pike Haw  
Applethwaite Member Coniston Area
Stockdale Rhyolite Coniston Area
Stile End Member Stockdale Quarry
Longsleddale Member  
Rawtheyan Borrowdale Volcanic Group Coniston Area
Cautleyan  
Pusgillian  

Caradoc
449 - 458 MYA
Upper Borrowdale
Volcanic Group
 Yewdale Formation Coniston Area
Yewdale Breccia Barrow
Coniston Area
Tilberthwaite Tuff
 Barrow
High Fell Quarry
Onnian
 Onny Shales The Onny Trail
Actonian Acton Scott Group The Onny Trail
Marshbrookian Cheney Longville Flags The Onny Trail
Woolstonian Alternata Limestone The Onny Trail
Longvillian Chatwell Sandstone The Onny Trail
Soudleyan Chatwell Flags The Onny Trail
Harnagian Harnage Shales The Onny Trail
Costonian Hoar Edge Grit The Onny Trail
Mydrim Shales Druidston Haven
Lower Borrowdale
Volcanic Group		 Seathwaite Fells Barrow
Airy's Bridge Barrow

Llanvirn
458 - 470 MYA
Skiddaw Group & Eycott Volcanic Group
Latterbarrow Siltstones and Sandstones  
Tarn Moor
  
High Ireby Binsey  
Murchisoni shale's Abereiddy
didymograptus bifidus beds Abereiddy
Castell Limestone Abereiddy
Betton Shale Formation  
Weston Flags Formation Betton Dingle
Llandeilo shales Porthgain
Hope Shale Formation Hope
Stapeley Shale Formation  
Hyssington Volcanic Formation  

Arenig
470 - 485 MYA
Skiddaw Group & Eycott Volcanic Group
Kirkstile Slates
Buttermere Formation Stair Stream
Loweswater Flags
 
Hope Beck Slates  

Tremadoc
485 - 495 MYA
Skiddaw Group & Eycott Volcanic Group
Hope Beck Slates  


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