2 A FLORA OF GLAMORGANSHIRE 



3. Tawe : The eastern boundary proceeds from a point in the 

 Glamorgan -Brecon border very close to where the latter is crossed 

 by the Neath and Brecon Railway, passes over the summit of 

 Farteg Hill, through Cil-y-bebyll and west of Mynydd March 

 Hywel; and goes south and south-west to the slope of Mynydd 

 Drymau, through Skewen and along the road to Briton Ferry 

 Road Station and the sea. It is all comprised within the coal 

 measures, and includes the famous Crumlin Bog and the sands of 

 Swansea Bay. 



4. Neath: Including a small portion of the millstone grit, but 

 otherwise limited to the coal measures. The east boundary goes 

 from a point on the Brecon border within a mile of Hirwaun Ponds, 

 due south on to Hirwaun Common ; thence turns west over the 

 highest ground in the county (Carn Fach, 1969 ft.) above Craig- 

 y-llyn, and follows the old mountain road, Cefn ffordd, over Cefn 

 Grog ; south-west and west over Cefn Mawr, keeping above Glyn 

 Corwg and Cwm Blaen Pelena ; and from Cefn Morfydd takes an 

 arbitrary line south-west to the point of Baglan Bay. 



5. Afan : again mostly on the coal measures, which consist of 

 lofty hills cut up by densely populated colliery valleys, and fronted 

 by a considerable width of marsh, and extensive burrows. East 

 and south it is limited by a line drawn from Carn Fach southwards 

 to about Graig Fawr at Treorchy ; there it turns westward sharply 

 to the tunnel near Spelter, and takes an irregular southward 

 direction over Rhiw Tor Cymry, past Twmpath Diwlith ; and so 

 follows the mountain road to the G.W.R, above Laleston. Thence 

 it follows the railway to Pyle, and turns through North Cornely to 

 the sea at Sker Point. The glacial gravel drift is found at the foot 

 of the hills between Margam and Kenfig; Sker Point itself is 

 composed of a conglomerate limestone belonging to the Triassic 

 series ; and very small portions of the lias and mountain limestone 

 come in at Pyle. 



6. Ogmore or Ogwr : including colliery districts, a narrow band 

 of millstone grit and some mountain limestone tracts (Ewenny 

 Down, Stormy Down, Porthcawl, &c), and a good part of the lias of 

 the Vale of Glamorgan with Bridgend as centre. Glacial drift, the 

 alluvium of the river beds, and a large tract of blown sand at 

 Porthcawl, complete the tale. The eastern boundary goes from 

 Graig Fawr, Treorchy, over Mynydd William Meyrick above the 

 sources of the Ogwr Fach to the top of Mynydd Maendy ; thence to 

 Mynydd Garth Maelwg, and past Llanharan and Llanilid by the 

 road to Nash ; and westwards through Wick to the sea at Whit- 

 more Stairs. 



7. Ddaw: which lies mostly in the Vale on the beds of the 

 Triassic series, with, however, considerable tracts of glacial drift, 

 patches of mountain limestone at St. Hilary, &c, and traces of 

 the old red sandstone. It marches with district 8 from a point 

 near Llanilid, through Ystradowen, Welsh St. Donat's, Bonvilstone, 

 St. Nicholas, Leckwith, to Lavernock Point, and includes the Flat 

 Holm. The only considerable centre of population is Barry* 

 There are no high hills. 



