(Pre-Cambrian Quarry at the end of the trail) - 2003

Most of the rocks along the trail are Ordovician age, and are from the 'Caradoc' Stage. However Silurian and other Ordovician rocks from Stiperstones & Lond Mynd can be found in the river bed along the trail. It is difficult to pinpoint the exact formations that these rocks come from. However Silurian rocks from the Pentamerus Beds and Hughley Shales can be found at the South East part of the trail.

Silurianfishes by Joseph Smit (1836-1929) from Nebula to Man 1905 England

Silurian	Pridoli		417 to 419
	Ludlow	Ludfordian	419 to 421
		Gorstian	421 to 423
	Wenlock	Homerian	423 to 426
		Sheinwoodian	426 to 428
	Llandovery	Telychian	428 to 433
		Aeronian	433 to 438
		Rhuddanian	438 to 443

Ordovician	Ashgill	Hirnantian	443 to 444
		Rawtheyan	444 to 445
		Cautleyan	445 to 447
		Pusgillian	447 to 449
	Caradoc		449 to 458
	Llanvirn		458 to 464
		Abereiddian	464 to 470
	Arenig	Fennian	470 to 475
		Whitlandian	475 to 480
		Moridunian	480 to 485
	Tremadoc		485 to 495

Llandovery 428 - 443 MYA
FORMATIONS AND DEPOSITS			LOCATIONS
Telychian	Upper Brathy Flag Formation	Turriculatus Zone	Stockdale Beck
		Grispus Zone
Aeronian	Lower Brathy Flag Formation	Red Beds	Stockdale Beck
		Green Beds
	Hughley Shales		The Onny Trail
	Pentamerus beds		Hillend The Onny Trail
Rhuddanian	Browgill Beds	Centrifugus Zone	Stockdale Beck Coniston Area
		Murchisoni Zone
		Riccartonensis Zone
	Skelgill Beds		Stockdale Beck

Caradoc 449 - 458 MYA
FORMATIONS AND DEPOSITS		LOCATIONS
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

1:250 000 Geological Map of Onny Trail Geological Maps are sold either Flat or Folded for Solid, or Seabed geology. Special editions may be available for certain locations. For a complete list click the link below. Click here to BUY ONLINE from our Store

1: 50 000 Geological Map of Onny Trail Geological Maps are sold either Flat or Folded for Solid, Drift or combined geology. Special editions may be available for certain locations. For a complete list of 1: 50 000 maps, click the link below. Click here to BUY ONLINE from our store