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Gwna Melange, N. Wales

Gwna Melange, N. Wales
Gwna Melange at Tryn-maen-melyn, Uwchmynydd, Lleyn Peninsula, North Wales
Gwna Melange at Tryn-maen-melyn, Uwchmynydd, Lleyn Peninsula, North Wales
Gwna Melange at Tryn-maen-melyn, Uwchmynydd, Lleyn Peninsula, North Wales. See The Geologists' Association Field Trip Guide No. 39, "Lleyn Peninsula", Cattermole, P.J and M. Romano, 1981. In the GA Guide, This location is Number 7, of the field trip Itinerary I (Uwchmynydd Peninsula"). Shown is a large phacoid-shaped block of quartzite and marble(?) in sheared meta-sediment. Photo E. Medley, 1992.
weaker block/matrix contact in Gwna Melange at Tryn-maen-melyn, Uwchmynydd, Lleyn Peninsula, North Wales.
weaker block/matrix contact in Gwna Melange at Tryn-maen-melyn, Uwchmynydd, Lleyn Peninsula, North Wales.
Preferentially eroded weaker contact between blocks and matrix. Gwna Melange at Tryn-maen-melyn, Uwchmynydd, Lleyn Peninsula, North Wales. See The Geologists' Association Field Trip Guide No. 39, "Lleyn Peninsula", Cattermole, P.J and M. Romano, 1981. In the GA Guide, This location is Number 7, of the field trip Itinerary I (Uwchmynydd Peninsula"). Photo E. Medley, 1992.
Weaker block/matrix contact; Gwna Melange at Tryn-maen-melyn, Uwchmynydd, Lleyn Peninsula, North Wales
Weaker block/matrix contact; Gwna Melange at Tryn-maen-melyn, Uwchmynydd, Lleyn Peninsula, North Wales
Gwna Melange at Tryn-maen-melyn, Uwchmynydd, Lleyn Peninsula, North Wales. See The Geologists' Association Field Trip Guide No. 39, "Lleyn Peninsula", Cattermole, P.J and M. Romano, 1981. In the GA Guide, This location is Number 7, of the field trip Itinerary I (Uwchmynydd Peninsula"). Shown is is block/matrix contact: the contact is the weakest element in this bimrock, as evident by preferential erosion/weathering. Photo E. Medley, 1992.
Gwna Melange at Bodorgan Estate, near Aberffraw, Island of Anglesey, North Wales.
Gwna Melange at Bodorgan Estate, near Aberffraw, Island of Anglesey, North Wales.
Typical boudins and phacoids of resistant quartzite/marble blocks in weaker sheared meta-sediments. The fabric is pervasively sheared, with pronounced anisotropy. Gwna Melange at Bodorgan Estate, near Aberffraw, Island of Anglesey, North Wales. See The Geologists' Association Field Trip Guide No. 40, "Anglesey", Bates, D.E.B and J.R. Davis, 1981. In the GA Guide, This location is between stops Number 9 and Number 10, of the field trip Itinerary II ("Central West Anglesey"). Photo E. Medley, 1992)
Phacoid/lenticular block of quartzite/marble in Gwna Melange at Bodorgan Estate, near Aberffraw, Island of Anglesey, North Wales.
Phacoid/lenticular block of quartzite/marble in Gwna Melange at Bodorgan Estate, near Aberffraw, Island of Anglesey, North Wales.
Typical boudins and phacoids of resistant quartzite/marble blocks in weaker sheared meta-sediments. The fabric is pervasively sheared, with pronounced anisotropy. Gwna Melange at Bodorgan Estate, near Aberffraw, Island of Anglesey, North Wales. See The Geologists' Association Field Trip Guide No. 40, "Anglesey", Bates, D.E.B and J.R. Davis, 1981. In the GA Guide, This location is between stops Number 9 and Number 10, of the field trip Itinerary II ("Central West Anglesey"). Photo E. Medley, 1992)

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