piirt 2^ lAUHoNirKHors mmkstonk uf s. walks ( (»AM IELI). 



12; 



tliinly-l>tHUU'J liiiiostoiu's in the lower part of tlio sirtion show seams 

 of smooth calcit<.'-miulstoiu' interbandeil witli hi vers of hi*^lilv 

 oolitic limestone: the oolitie hands are ostracodal and slii^htly 

 gritty, and contain Srrpuin and aly^al structures. 



Fig. 5. — Sf'cftoif of the loircr jKirf of the Loiccr Li uirstonr Shales. 

 stream helviv Coed-i/- Mochi/ii, irestent side nf the Khhir 

 rallej/, altore Pont-i/- Mister (Mnn. 'J8 SW \ 1) . (Vertical 

 scale : 1 i nrh = li) feet.) 



Crixoiua 



LlMKSION 



& 



OoMTK 



K'2). 



LlMKSlONKS 



& 



81IALKM 



(1). 



'•>:' . ! 



ir^ — ^ 



cxzi 



IIZ-^ 



1 r 



izn 



j_-. 



Grey, urinoidal limi-stont', slightly oolitic and jjritty 

 f Ciiiiutrofachiii uiitcheldeaneittis and SchtUwienell i 

 vi. crcnmtriii altimihinf. Os.tracod-'. Hhabdoineson. 



Fin«'-grHiiu'd. gritty liim'>toni'. OstravodH and Moili- 

 o/a-likf lamellibranehs abundant. A littlr crinoid- 

 debris. 



Crinoidal limestono witli *o:ni' -hale. In part tin. 

 praincd, gritty inuu-h d« raliill«-d ). 



(Tit-y, crinoidal and slu-ily linustont-, with a haaal 

 layer (np t>i»i inchi-* in thit>kn«'«H) of hipniatitic* linu- 

 »tonf of «-tv|><'. Till- a-linii-t<tont> (a * hryozoa-bi-d ' 

 with abnn.lant Kkiihdo»ip^o,\) pagci's laterally into 

 ({fey linn-Hlone : both end')-*!- lu-bblcs of falcitt— 

 nindstoni- containing Srffniln. Ciuinrolaechut 



i,ii(cheldeaiiein>i.s, SchelhrieneUn rf. crrniafria, 

 Lffitttixi iinalo'jn, abundant. Productun /ni^Mut, 

 Chointit ef. kurdrensii, Sprt/rr cfulhrutiu. 



Lmi»'-.t«ni<'9 and shali-u (poorly fXpoa<Hi]. One band 

 oflinieHtone tthoWH neams of light-grey csUit -mud- 

 utom- and dark-gn-y, oolitic, ONtraoodal limestone. 



Caleareoufl grit : grey grit, hit'hlv calf,»r«'OUH. miift- 

 eeotiK, and slightly felHimt hie. ('nf..Msiliferon!*. 



At Tongwynlais, iii tlic TafT valley, an excavation on the hill- 

 Mth- 2()() vards east-north-iast of the church exposes hrds near the 

 has*' «)f tlie grou]), while a cutting on the (ardiff Hailway, at the 

 nortlu'rn end of the village, traverses the upper heds and exposes 

 tlu'ir jinietion witli tlw overlyiiii; ei-inoidal limotones. 



