2nd Edition In the first half of the book Paul discusses the mountain formation Paul Gannon is a science and of central Snowdonia. The second half of the book details technology writer. He is author Snowdonia seventeen walks, some easy, some more challenging, which bear Snowdonia of the Rock Trails series and other books including the widely evidence of the story told so far. A HILLWalker’s guide TO THE GEOLOGY & SCENERY praised account of the birth of the Walk #1 Snowdon The origins of the magnificent scenery of Snowdonia explained, and a guide to some electronic computer during the Walk #2 Glyder Fawr & Twll Du great walks which reveal the grand story of the creation of such a landscape. Second World War, Colossus: Bletchley Park’s Greatest Secret. Walk #3 Glyder Fach Continental plates collide; volcanoes burst through the earth’s crust; great flows of ash He also organises walks for hillwalkers interested in finding out Walk #4 Tryfan and molten rock pour into the sea; rock is strained to the point of catastrophic collapse; 2nd Edition more about the geology and scenery of upland areas. Walk #5 Y Carneddau and ancient glaciers scour the land. Left behind are clues to these awesome events, the (www.landscape-walks.co.uk) Walk #6 Elidir Fawr small details will not escape you, all around are signs, underfoot and up close. Press comments about this series: Rock Trails Snowdonia Walk #7 Carnedd y Cribau 1 Paul leads you on a series of seventeen walks on and around Snowdon, including the Snowdon LLYN CWMFFYNNON “… you’ll be surprised at how much you’ve missed over the years.” Start / Finish Walk #8 Northern Glyderau Cwms A FON NANT PERIS A4086 Carneddau, the Glyders and Tryfan, Nant Gwynant, Llanberis Pass and Cadair Idris. Pen-y-Pass A498 I I I I I LLYN I I Colin Wells (Climb magazine) I I I I I I I I TEYRN I I I I I I I I I I I I I I I I I I I I I I Mawr Glas Cwm I I I 923m I I I I I I Crib Coch Pyg Track I I I I I I I I I I I I I I I Walk #9 Nant Gwynant I I I I I Cwm Dyli I I I I I I I I I I I I I I Each walk reveals fascinating evidence of geological upheaval, and spectacular views I I Clogwyn I I I I I I Station I I I I I I I I I I I I I I I I ck Mi ’s Tra I ner Gallt y 1065m I Wenallt619m I Garnedd Ugain I I I I I I LLYN I I I I I I I I I GLASLYN LLYN LLYDAW I I I I I DU’R ARDDU I I I I I Rock Trails Lakeland I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I Summit I I I I I Station I I Y Lliwedd898m I Walk #10 Llanberis I I I I I I I I I I I I I I I I I I of the very best scenery of Snowdonia. I Snowdon1085mI I I I Cwm Clogwyn I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I “Others have dealt with the geology, but few have described it 1km YD (6610 5595) Walk #11 Llanberis Pass GWR 0 Y Walk #1 Snowdon SS (647 556) OR PEN TH AND REMOTENESS) with such enthusiasm and clarity.” PEN Y PAULAR ROUTE + CIRC ••••• Walk #12 Cwm Glas Mawr (DUE TO LENG 6 HOURGSATION ••••• START H NAVI ••••• New in the 2nd Edition: FINIS TERRAIN TIME SEVERITY GRADE 117 The Cumberland News Walk #13 Vivian and Dinorwig Quarries Pen y Pass can become full quite early in the day (especially at Coverage of Southern Snowdonia. As the car park at weekendsThe and recommended in summer) ascent it often makes makes use sense of the to fairlyuse the easy Sherpa Miners’ bus Track service. – easy for its Rock Trails Peak District first half anyway, followed by a stiff climb on a good track. It offers a relaxed start to Walk #14 Crimpiau & Creigiau Gleision the walk, taking you into the jaws of the glacial cwms, where the mountain rears up above you all around, conveying the sense of size of the glaciers which once flowed New improved maps. down here. “The best Peak District guidebook so far produced.” Walk #15 Moelwyn Mawr Six new walks. Down to Earth magazine Walk #16 Cadair Idris Paul Gannon Paul Walk #17 Llanddwyn Island ISBN 978-1-906095-42-0 Snowdonia Paul Gannon 9781906 095420 2nd Edition A HILLWalker’s guide TO THE GEOLOGY & SCENERY ISBN 978-1-906095-15-4 ISBN 978-1-906095-24-6 ISBN 978-1-906095-38-3 Llyn Llyn Llyn Llyn Llyn Eigiau Eigiau Eigiau Eigiau SNOWDON VOLCANIC GROUP VOLCANIC Llyn y MynyddSNOWDON Mynydd y Llyn Llyn y Mynydd Mynydd y Llyn SNOWDON VOLCANIC GROUP (ORDOVICIAN) Carnedd Carnedd (ORDOVICIAN) Llewelyn Llewelyn 1064m 1064m (MG) Microgranite (MG) Carnedd Carnedd (MG) Microgranite Landscape around Snowdon Llewelyn Snowdon around Geology GeologyLlewelyn around Snowdon Snowdon around Landscape 0 1 Rhyolite Intrusive 2(IR) 3 3 2 1 0 0 1 2 3 3 2 1 0 (IR) Intrusive Rhyolite Kilometres Kilometres Kilometres Kilometres A4244 Miles Miles A4244 A4244 Miles Miles A4244 Carnedd Carnedd 0 Lava Basalt (B) 2 A5 A5 2 0 0 2 A5 A5 2 0 (B) Basalt Lava Dafydd 1044m A4086 A4086 1044m Dafydd A4086 contours at 50m intervals Ffynnon Ffynnon Ffynnon intervals 50m at Ffynnoncontours A4086 Carnedd Carnedd Llugwy Marchlyn hlyn c Mar Llugwy Llugwy Marchlyn hlyn c Mar Llugwy 821m Dafydd Dafydd 821m (URT) Upper Rhyolitic Tuffs Rhyolitic Upper (URT) Bach Filiast y Carnedd h c Ba Bach Carnedd y Filiast h c Ba (URT) Upper Rhyolitic Tuffs Carnedd y Filiast MG MG PT PT PT MG Filiast y Carnedd Llyn Llyn Ffynnon Ffynnon Llyn Llyn Ffynnon Ffynnon Llyn Cowlyd Formation Pyroclastic Bedded (BPF) Marchlyn Lloer Lloer hlyn c Mar Cowlyd Cowlyd Lloer Marchlyn hlyn c Mar Lloer (BPF) Bedded Pyroclastic FormationCowlyd Mawr Mawr LB LB LB Mawr Mawr PT PT PT Llyn Llyn Llyn Llyn PadarnTuffs Rhyolitic Lower (LRT) adarn P Padarn adarn P (LRT) Lower Rhyolitic Tuffs Elidir Fawr Elidir Elidir Fawr 923m 923m A4086 A4086 A4086 A4086 Elidir Fawr MG MG Quarry Dinorwig Dinorwig Quarry MG Fawr Elidir (PHT) Pitts Head Tuffs Head Pitts (PHT) (PHT) Pitts Head Tuffs Llyn Llyn Llyn Llyn Llyn Ogwen Ogwen Ogwen Ogwen LLEWELYN VOLCANIC GROUP VOLCANIC LLEWELYN LLEWELYN VOLCANIC GROUP Llanberis (ORDOVICIAN) A5 Terrace Heather A5 Llanberis LB LB LB A5 Llanberis Heather Terrace Llanberis A5 (ORDOVICIAN) IR IR SD SD SD IR CCV CCV CCV Llyn PHT PHT Garn Y Llyn Llyn Y Garn PHT Llyn (D) Dolerite Intrusion Dolerite (D) SD SD SD SD Llyn Llyn Llyn Llyn SD SD (D) Dolerite Intrusion Peris 947m eris P Peris 947m eris P al w Id Idwal al w Id Idwal Y GarnTryfan LRT LRT Garn Y LRT Tryfan Idwal Syncline Idwal Idwal Syncline (CCV) Capel Curig Volcanics Curig Capel (CCV) 805m 805m (CCV) Capel Curig Volcanics Tryfan Tryfan Capel Curig Capel ORDOVICIAN & CAMBRIAN CAMBRIAN & ORDOVICIANCapel Curig B B B Llyn Capel Curig Llyn Curig Capel Llyn Llyn IR IR Fach Glyder Fawr Glyder 994m 994m Glyder Fawr Glyder Fach IR Dwythwch Glyder Fach h c Dwythw Dwythwch Fach Glyder h c Dwythw (SD) Sedimentary Rocks Sedimentary (SD) IR IR 999m BPF BPF 999m BPF IR (SD) Sedimentary Rocks Glyder Fawr Fawr Glyder 726m IR IR Eilio Moel Moel Eilio IR 726m CCV CCV CCV Moel Eilio Llynau D D D Eilio Moel Llynau Mymbyr CAMBRIAN Llynau Llynau CAMBRIAN Mymbyr MymbyrSD SD Mymbyr SD IR IR IR A4086 SD SD PHT PHT A4086 A4086 A4086 PHT SD (LB) Llanberis Slates Llanberis (LB) A4086 D D A4086 A4086 D A4086 (LB) Llanberis Slates Llyn Llyn Llyn Llyn Llyn Cwmffynnon Cwmffynnon fynnon f Cwm Cwmffynnon (PT) Padarn Tuffs Padarn (PT) LRT LRT LRT (PT) Padarn Tuffs D D PHT PHT PHT D Special Sheet: 1972, Central Snowdonia Special Sheet: 1972, based on geology around Snowdon simplified simplified geology around Snowdon based on geology around Snowdon simplified Central Snowdonia Special Sheet: 1972, D D Crib Goch Goch Crib D Garnedd Ugain Ugain Garnedd BPF BPF BPF 923m IR IR IR 923m 1055m LRT LRT URT URT URT LRT1055m IR IR A A IR IR IR R R IR E E Llyn Siabod Moel Llyn Llyn D Llyn Llyn D Llyn Llyn Moel Siabod Llyn Cwellyn Llydau Llydau L CweLlyn CweLlyn L Llydau Llydau Cwellyn D D A 872m 872m A D Glaslyn D D D D Glaslyn C C Glaslyn D Glaslyn D A498 A498 Moel Siabod Siabod Moel A498 A498 1085mLlynau C 1085m C Llynau A Snowdon Snowdon A Snowdonaunedd L w Di Llynau Llynau Snowdon DiwLaunedd D Diwaunedd aunedd w Di D E D D D E R Summit Snowdon Snowdon Summit R A A © copyright British Geological Survey © copyright © copyright British Geological Survey © copyright 591m 591m Carnedd y Cribau y Carnedd IR IR BPF BPF BPF IR Carnedd y Cribau Carnedd y Cribau LRT LRT Cribau y Carnedd LRT D D D Rhyd-Ddu 898m Rhyd-Ddu Rhyd-Ddu 898m Rhyd-Ddu Y Llywedd Llywedd Y SD SD SD Llyn Llyn Llyn Llyn y Gwynant y Llyn Llyn y Gwynant y Llyn SD SD SD Gader Llyn LRT LRT Gader Gader LRTLlyn Gader A4085 Gwynant A4085 A4085 Gwynant A4085 SD SD SD LRT LRT BPF BPF BPF LRT 747m Aran Yr Yr Aran 747m Yr Aran Aran Yr PHT PHT PHT D D D IR IR IR IR IR IR Snowdonia 2nd Edition Paul Gannon www.pesdapress.com Cover Photo: Crib Goch, Snowdon First published 2008 Second edition 2013 Published in Great Britain 2013 by Pesda Press Unit 22, Galeri Doc Victoria Caernarfon Gwynedd LL55 1SQ © Copyright 2013 Paul Gannon ISBN: 978-1-906095-42-0 The Author assert the moral right to be identified as the authors of this work.