... 1984; Barnes & Andrews 1986; Holder & Leveridge 1986). Palynology. A suite of 14 samples was collected from the parautochthonous Mylor Slate Formation and allochthonous Portscatho Formation (Holder & Leveridge 1986), on the west coast of the Lizard Peninsula (Fig. 1). Palynomorphs were...

.... There is evidence for stoping of the country rocks by an outward-migrated sill and dyke network, and uplift and doming of the host rocks can be partially attributed to laccolith inflation. Host meta-siltstones of the Devonian Mylor Slate Formation formed a contact aureole of cordierite + biotite + chlorite...

... from the lithologically homogeneous Mylor Slate Formation next to the Tregonning Granite, an offshoot of the Cornubian batholith. The depletions are due to an H 2 O-CO 2 -N 2 (-CH 4 ) fluid formed during contact metamorphic devolatilization of the pelitic country rocks. Fluids of this type have been...

... and young to the south. The succession (Fig. 2) spans most of the Devonian from the Dartmouth Beds of Siegenian (see House & Selwood 1964), and possibly the uppermost Gedinnian, age (House 1975), up to the Mylor Slate Formation which has yielded Famennian palynomorphs (Turner et al. 1979). The Dartmouth...

...Figure 8. (A) West-east profile across the Tregonning granite, from Praa Sands, Rinsey Cove, and Megiliggar rocks of SW England. (B) The three horizontal leucogranites and aplite-pegmatite sills intruding into the contact metamorphosed Mylor Slate Formation, along the eastern margin...

...). The metasedimentary samples were considered representative of the Devonian Mylor, Ports- catho, Porthtowan, Meadfoot and Kate Brook Slate Formations which constitute the principal country rocks for the Hercynian granites. Data for the intercalated Middle and Lower Devonian calc-alkaline and alkaline volcanic rocks...

.... E. Taylor R. G. Goode A. J. J. Owens B. Palynological evidence for the age of the Mylor slates, Mount Wellington, Cornwall Proc Ussher Soc 1979 4 274 83 Turner, R. G. 1969. The influence of granite emplacement on structure in South-West England. Thesis, PhD, Univ...

... is part of this complex. Zone 9 is developed in the Gramscatho and Mylor Beds which are now thought to be mainly of Middle Devonian age (Hendriks et al. I97 I) and, therefore, are equivalent, in part, to the slate sequence of north Cornwall. Sanderson (197 I) has suggested that there is a slide contact...

... of greywacke sandstone and siltstone. It is in sequence between the Meadfoot Group, which in its northern outcrop is Lower Devonian (House & Selwood 1964), and the Mylor Slate Formation which is largely Upper Devonian (Turner et al. 1979). The Portscatho, Pendower and Came Formations constitute the Group...

... Turner R. E. Taylor R. T. Goode A. J. J. Owens B. Palynological evidence for the age of the Mylor Slates, Mount Wellington, Cornwall Proceedings of the Ussher Society 1979 4 274 83 Wadge G. Burke K. Neogene Caribbean plate rotation and associated Central American...

... intruded into the Upper Devonian Mylor Slate Formation of the Gramscatho Group ( Fig. 2a ). It forms the most westerly mainland exposure of the Cornubian Batholith and provides consistent exposure of the granite and its margins in coastal outcrop. The present-day shape of the pluton is unusual compared...

... (SXO93910) where it lies in thrust contact above rocks of the Trambley Cove Formation, Tintagel Volcanic Formation and Barras Nose Formation which in turn overlie grey slates of the so-called Transition Group (Freshney et al. 1972 fig. 1). From Western Blackapit southward to Tregardock Beach, there Fig. 4...

...-west England. Proc. Ussher Soc. 2~ 115-2 I. x97I. Some aspects of the tectonic evolution of south-west England. Proc. Geol. Ass. 8x~ 483-9 2 DOBSON, M. H. & REx, D. C. 197 x . Potassium-argon ages of slates and phyllites from south-west England. Q. Jl geol. So¢. Lond. x26, 465-99. t-IADLEY, J. B...

... the hanging wall of the Carrick Thrust ( Leveridge & Holder, 1985 ), is in marked contrast with the absence or very small Na/K mica and paragonite contents in the Upper Devonian Mylor Slate Formation forming the footwall of the thrust. The occurrence of pyrophyllite in Devonian rocks appears...

... precipitation. The main study area is situated on the west coast of the Lizard Peninsula in southwest Cornwall ( Fig. 3). The Devonian metasediments in this region have been divided into two lithofacies ( Holder & Leveridge 1986): the Porthscatho Formation and the Late Devonian Mylor Slate Formation...

... Pyroclastic Formation of central Snowdonia, and the Middle Crafnant Volcanic Formation of eastern Snowdonia, and showed that, whilst synchronous, two very different volcanic facies derived their material from different sources––the Bedded Pyroclastics from the Snowdon area and the Middle Crafnants from...

... (dominantly slates) belonging to the Mylor Slate Formation, of Upper Devonian (Famennian) age, known locally as ‘Killas’ ( Bristow et al . 1998 ; Le Boutillier et al . 2001 ). At depths of c. 250–300 m below surface, these sediments give way to granite of the Carn Brea stock that was contacted in many...

... M. H. Rex D. C. Potassium-Argon ages of slates and phyllites from south-west England Quarterly Journal of the Geological Society of London 1971 126 465 99 Edwards R. A. Freshney E. C. Geology of the Country around Southampton Memoirs of the British Geological Survev...