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Gellir gweld pentref Cefn Mawr yn glir o ddyfrbont Pontcysyllte, ar fryn amlwg tua’r dwyrain. Mae’r bryn yn grib o dywodfaen. Oddi yma, roedd chwareli’n cyflenwi carreg adeiladu ardderchog i greu’r pileri main, tal sy’n cynnal y ddyfrbont ar draws Dyffryn Dyfrdwy.
Defnyddiwyd y garreg o’r ansawdd gorau o Gefn Mawr i adeiladu tai crand ac adeiladau pwysig yn yr ardal ers y Canol Oesoedd. Wrth i ddiwydiant gynyddu cyfoeth y pentref, adeiladwyd bythynnod a siopau o’r garreg hon hefyd. Pan gaiff ei thorri gyntaf, mae’r garreg yn lliw melyn golau ond mae’n hindreulio i fod yn lliw euraidd cryf ar ôl ychydig flynyddoedd.
Mae Carreg Cefn yn wydn ond gellir ei thorri’n fanwl gywir i sicrhau bod pob bloc yn ffitio’n berffaith. Bu i’r peirianwyr Thomas Telford a William Jessop sylwi ar ei hansawdd pan oedden nhw’n adeiladu’r gamlas. Aethant ati i’w defnyddio i adeiladu Dyfrbont y Waun. Dyma oedd y dewis naturiol hefyd ar gyfer Dyfrbont Pontcysyllte.
Lledaenodd enwogrwydd Carreg Cefn y tu hwnt i’r ardal leol. Erbyn 1845, roedd cymaint â 1,000 o dunelli’n cael eu cludo o’r chwareli bob blwyddyn, llawer ohono ar hyd y gamlas. Yn y pen draw, disbyddwyd y garreg orau a bu i’r chwareli gau.
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Gwely tywodlyd aberoedd trionglog afonydd hynafol oedd tywodfaen yn wreiddiol. Dros filiynau o flynyddoedd, cafodd y tywod ei gynhesu a’i gywasgu’n graig dan bwysau mwy o haenau’n ffurfio ar ei ben. Mae lefel uchel o grisial cwarts mewn tywodfaen, sy’n ei wneud yn galed ac yn rhoi arwyneb garw, grutiog iddo.
Clogfaen tywodfaen ©Andrew Deathe
Roedd y tywodfaen yn cael ei weithio â llaw oddi ar wyneb y chwarel. Roedd y chwarelwyr yn torri’r graig â chŷn ac yn drilio i mewn iddi i greu craciau. Morthwyliwyd lletemau i mewn i’r craciau, gan hollti’r blociau enfawr o garreg oddi ar wyneb y graig. Yn yr hen chwareli, mae’r marciau cŷn a wnaed dros ganrif yn ôl i’w gweld o hyd.
Marciau cŷn chwarel Tan y Graig ©Andrew Deathe
Mae prif strydoedd Cefn Mawr yn troelli o amgylch ymyl crib y tywodfaen. Mae nifer o’r siopau, tafarndai a thai wedi’u hadeiladu ar derasau a dorrwyd i’r graig wrth chwarelu’r garreg. Mae rhai adeiladau wedi’u gwasgu i mewn i fannau bychain ac ar onglau anarferol.
Stryd Cefn Mawr: Trwy garedigrwydd Amgueddfa Cefn Mawr
Mae Minshalls Croft yn un o nifer o lonydd serth, cul yng Nghefn Mawr. Incleins oedd y rhain yn wreiddiol, sef rheilffyrdd serth a oedd yn cludo’r garreg o’r chwareli i lawr i’r tramffyrdd mwy gwastad a dynnwyd gan geffyl. Roedd y rhain yn mynd â’r garreg i iardiau gwaith maen i’w torri a’u siapio, ac yna ymlaen at y gamlas neu’r rheilffordd i’w cludo i fannau eraill.
Minshall’s Croft ©Hawlfraint y Goron: CBHC
Mae gan yr ardal o amgylch Cefn Mawr hefyd glai ardderchog ar gyfer gwneud brics. Erbyn canol y bedwaredd ganrif ar bymtheg, daeth brics yn llawer rhatach i’w cynhyrchu na charreg. Dim ond ar gyfer adeiladau pwysig lleol neu i’w chludo ar gyfer prosiectau mawreddog mewn mannau eraill y defnyddiwyd carreg wedyn. Mae adeiladau sy’n defnyddio’r ddau ddeunydd yn hawdd eu gweld o amgylch Cefn Mawr.
Adeilad brics a thywodfaen ©Andrew Deathe
Mae nifer o’r chwareli yng Nghefn Mawr bron wedi diflannu dan adeiladau diweddarach, ond mae un yn dal i fod ar agor yn rhannol. Mae perchennog Tan y Graig yn defnyddio carreg sydd newydd ei thorri o’r chwarel i adeiladu tai newydd ar y safle. Mae ambell i fwthyn chwarelwr o’r bedwaredd ganrif ar bymtheg hefyd yn dal i sefyll yn y chwarel.
Chwarel Tan y Graig ©Andrew Deathe
Mae rhai o’r chwareli segur o amgylch Cefn Mawr wedi cael eu hadennill fel coetir a pharciau. Bu i’r tîm pêl-droed lleol, Derwyddon Cefn, symud eu cae i’r Graig yn 2010, ac maen nhw bellach yn chwarae dan gefndir trawiadol wynebau craig blaenorol y chwareli.
Cae pêl-droed Y Graig ©weallstandtogether.blogspot.com
Pan adeiladwyd dyfrbont Pontcysyllte, adeiladwyd pob piler ychydig fetrau o uchder cyn codi platfform pren rhyngddynt i gyd i greu lefel weithio ar gyfer yr uchder nesaf. Mae tyllau sy’n dangos lle’r oedd cynheiliaid y platfform wedi’u clampio i’r gwaith cerrig i’w gweld hyd heddiw.
Tyllau sgaffald platform dyfrbont ©Andrew Deathe
Mae rhannau uchaf pileri Dyfrbontydd y Waun a Phontcysyllte yn wag. Bu i Jessop a Telford eu dylunio fel hyn er mwyn iddyn nhw allu cynnal y pwysau uwch eu pennau, ond bod y pileri eu hunain mor ysgafn ag oedd yn bosib. Yn y Waun, mae tyllau yn y bwâu yn gadael i weithwyr cynnal a chadw fynd i mewn i’r pileri.
Model gwag dyfrbont Y Waun ©Hawlfraint y Goron: CBHC
Dyn yn mynd ar ddyfrbont Y Waun ©Harry Arnold WATERWAY IMAGES
Llwyddodd y Garreg Cefn a ddefnyddiwyd ym Mhontcysyllte i bara’n dda iawn, am dros 200 mlynedd. Fodd bynnag, cafodd ychydig flociau o dan gafn y gamlas eu difrodi gan ddŵr. Disodlwyd y rhain yn 2003 gyda charreg o’r chwareli gwreiddiol. Maen nhw’n lliw goleuach ar hyn o bryd, ond maen nhw’n siŵr o hindreulio fel yr hen flociau ymhen amser.
Bloc carreg newydd yn nyfrbont Pontcysyllte ©Andrew Deathe
Rhoddwyd gwead garw ar bob un o arwynebau’r blociau Carreg Cefn gan y seiri maen. Wnaiff y cerrig ddim llithro yn erbyn ei gilydd, felly dim ond haen denau o forter sydd ei angen rhyngddyn nhw. Gwnaed y morter o waed ychen, calch a dŵr. Mae’r gwaed yn cynyddu ymwrthedd y morter i newidiadau mewn tymheredd.
Manylion gwaith maen yn nyfrbont Pontcysyllte ©Andrew Deathe
Mae Eglwys San Silyn yn Wrecsam yn un o adeiladau canoloesol pwysicaf Cymru. Fe’i hadeiladwyd o dywodfaen Cefn yn y bymthegfed ganrif, sy’n dangos ers cymaint o amser y mae’r garreg wedi cael ei gwerthfawrogi am ei hansawdd adeiladu. Yn digwydd bod, mae tŵr yr Eglwys bron yr un uchder â dyfrbont Pontcysyllte.
San Silyn, Wrecsam ©Jeff Buck / St Giles’ Church, Wrexham / CC BY-SA 2.0
Roedd Carreg Cefn yn cael ei gwerthfawrogi cymaint fel carreg adeiladu fel ei bod yn cael ei hallforio gryn bellter ar gyfer adeiladau pwysig. Ym Mangor, mae adeilad amlwg y brifysgol wedi’i adeiladu ohoni. Yn Lerpwl, mae Oriel Gelf Walker a Neuadd St George wedi’u hadeiladu’n bennaf o Garreg Cefn.
Neuadd San Siôr, Lerpwl ©Tony Hisgett
