Slate Boss atlas · American slate regions
Explore the source of American roofing slate, from the Slate Valley to historic districts across the country.
Tap the atlas to open it full size. Explore each region in the interactive map below.
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Slate Boss · Slate Roofing USA
Contiguous U.S. overview, not an exhaustive inventory. Markers indicate approximate districts or state references, not quarry boundaries. “Historic” does not establish closure. Confirm current roofing supply directly.
VT / NY · Producing district
The Fair Haven, Poultney and Granville region is a major American slate district, known for multiple natural colors. This marker represents the cross-border district, not an individual quarry.
Source: Vermont Geological Survey: slateA slate deposit, an operating quarry and an available roofing product are different things. Use the sources below to research origin, then confirm product testing, dimensions, color and supply with the producer.
Producing district · VT / NY
The Fair Haven, Poultney and Granville region is a major American slate district, known for multiple natural colors. This marker represents the cross-border district, not an individual quarry.
Read the sourceProducing district · PA
Slatington, Bangor and Pen Argyl form a historic slate belt. Penn Big Bed provides evidence of continuing quarrying and roofing-slate supply in the district; this does not mean all historic quarries remain open.
Read the sourceProducing district · VA
Virginia's Buckingham County contains the Arvonia slate district. Virginia Energy documents slate quarrying in 2024. Confirm roofing products and availability with the specific producer; quarry output also serves other markets.
Read the sourceHistoric district · VT
Central Vermont's Northfield Formation has a history of slate quarrying distinct from the western Slate Valley. Current roofing-slate supply is not verified here.
Read the sourceHistoric district · ME
Maine's historic slate country includes Monson and Brownville. The regional marker identifies documented slate heritage; it does not establish the operating status of any quarry today.
Read the sourceHistoric district · PA / MD
The Peach Bottom slate district crosses the Pennsylvania–Maryland border near Delta and Cardiff. Historic source records are useful when researching old roofs and matching reclaimed slate.
Read the sourceMapped occurrence · CA
California is listed among other U.S. outcrops on the supplied 2026 world map. This approximate state reference is not a verified operating roofing-slate quarry.
Read the sourceMapped occurrence · UT
Utah appears among other outcrops on the supplied world map. The marker is state-level; quarry coordinates, commercial roofing suitability and current supply are not verified.
Read the sourceMapped occurrence · AR
Arkansas is included among the world map's additional outcrops. This regional overview should be used to begin geological research, not as a supplier listing.
Read the sourceMapped occurrence · GA
Georgia is identified as an additional outcrop on the supplied map. This state-level marker does not identify an active roofing-slate producer.
Read the sourceMapped occurrence · TN
Tennessee is listed among additional slate outcrops. The map shows a state reference rather than a quarry entrance or confirmed source of roofing tiles.
Read the sourceMapped occurrence · MI
Michigan appears among additional outcrops in the supplied 2026 reference. This state-level marker is not evidence of current commercial roofing-slate production.
Read the sourceCompiled September 25, 2026. Regional points are approximate editorial references. State outlines: U.S. Census Bureau, 2023 cartographic boundaries, 1:20 million. Historical evidence includes USGS Bulletin 275 (1906); current status is not inferred from historic records. Additional occurrence references come from Prof. Víctor Cárdenes’ January 2026 world map supplied by Tim Kelly.
