A great video juxtaposing historical and modern slate mining in the Corris region of #Wales. It also features one of my favorite slate-related buildings, the 'Slate House' - the former office of the historic Aberllefenni quarry #geology #thestoryofslate
link.www.storyofslate.com/gXtgSE

A notice from Lord #Penrhyn warning quarrymen not to support the North #Wales Quarrymen's Union - it didn't work... #geology #thestoryofslate

Slate treads advertised in the J.S. Moyer & Co. 'Slate Products Catalog #2' from Bethlehem, PA c.1880 #geology #thestoryofslate

Cutting and dressing slates in the #Ballachulish slate quarry, Scotland c.1927. Interesting juxtaposition of slate on the roof in the background, metal on the splitting shed (likely because they moved so frequently). #geology #thestoryofslate

A detailed etching by Joan Williams c.1973 depicting slate tips, inclines and a few remnant drumhouses in North #Wales. #geology #thestoryofslate

A nice lithograph by Bernard Cheese illustrating the extensive stonework common in #Welsh quarries c.1962. link.www.storyofslate.com/QOYqDj #geology #thestoryofslate

Fantastic detail in this 1920 OS map: inclines, railways & mill buildings surrounding Blaenau #Ffestiniog, #Wales. #geology #thestoryofslate

Generalized geology of the Ardenne-Eifel area & Ardennes slate belt - apparently the first place where the term Boudin was used. #geology #thestoryofslate

A more detailed geology map depicting a sliver of the 'Waterford' or Meetinghouse Slate in Waterford, #Vermont. #geology #thestoryofslate

The Great Southern & Western Railway transported Irish slate from the Valentia Quarry to Valentia port #geology #thestoryofslate

Pretty dramatic growth in the #Delabole Quarry, Cornwall between 1884 & 1905 in these OS maps. #geology #thestoryofslate

Generalized geologic map depicting exposures of Meetinghouse Slate in Wateford, VT = another source of #Vermont slate. #geology #thestoryofslate

1896 cross sections from the Lake District, UK including the Skiddaw Slate within the Kirkstile Formation #geology #thestoryofslate

Some nice photos of abandonded slate quarries in the English Lake District, UK. #geology #thestoryofslate

Aerial view of the Mardasson quarry & WWII memorial in Bastogne, Belgium - part of the High-Ardenne slate belt #geology #thestoryofslate

The quarries of #Easdale Island, Scotland are easily identified on this 6" Ordnance Survey map of Argyllshire c1875 #geology #thestoryofslate

An advertisement for stone-cutting services in Portland, #Maine from Barlett Adams - a very talented slate carver! #geology #thestoryofslate

Careful sorting and stacking of slate shingles at the Greaves' Wharf in Portmadog, #Wales #geology #thestoryofslate

Sequence of images capturing the 1896 'Great Blast' at the #Penrhyn Quarry, #Wales - they used 7 tons of gunpowder! #geology #thestoryofslate

Similar to other regions in the USA following large urban fires, slate 'migrated' along rivers & railways to New Orleans #geology #thestoryofslate