page_title: Llewelyn Volcanic Group
hierarchical_section_title: Llewelyn Volcanic Group
caption_attribution_description: English: Ffynnon Lloer, Carneddau
context_page_description: The Llewelyn Volcanic Group is an Ordovician lithostratigraphic group in Snowdonia, north-west Wales. The name is derived from Carnedd Llewelyn, the highest peak in the Carneddau range where it outcrops.
context_section_description: The Llewelyn Volcanic Group is an Ordovician lithostratigraphic group (a sequence of rock strata) in Snowdonia, north-west Wales. The name is derived from Carnedd Llewelyn, the highest peak in the Carneddau range where it outcrops.
caption: Rhyolitic ash-flow tuffs of the Capel Curig Volcanic Formation exposed on the northeastern face of Pen yr Ole Wen, capped by sandstones of the overlying Cwm Eigiau Formation, which can be seen at the top of the face
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