'I'HK OEOLOGUf. 
and cspcciall}- Peiit;imoi'U3. This group consists ut soft, argillaceous 
sandstones and building stones (Golcugoed), shales, sonic calcareous 
bands, hard, course grits, and quartzose, pebbly conglomerates. Thickness 
2,000 to 3,000 feet. 
Locah'iies. — Eotli n^rmbers of this group, and their relations to the 
overlying and subjacent rocks, are well exhibited at Noeth Griig, near 
Llandovery, South Wales. In lladnorshire, Shropshire, and Hereford, 
the upper member, or Fentamerus ohJongiis zone, is alone present, and 
is seen in some places to be unconformable to the Longmynd and 
Caradoc rocks. The conglomerates of the west flank of the Malvcrns, 
and the sandstones of ITay Hill and Huutly, Gloucestershire, are of 
this age. 
CHAEACTERISTIC FOSSILS OF THE LLANDOVERY KOCKS. 
Trilohila. — Eucrinurus punctalus, Phacops Stokesii. 
IJracliiopoda. — ■Rlijiiclioiiella angiistifrons, Orthis viigata, O. rcversa, Pentainerus 
Jens, P. undatus, P. obloiigus, Liiigula cnujieiia,Sttophoiiicna pecten, Atrypahomis- 
liierica, A. crassa, A. inargiiitilis. 
P (iasteropoda. — llolopclla cancellata. 
Zuopliyta. — Petraia subiluplicata, P. eloiigata, P. bina. 
FOSSILS OF THE liLANDOVRliV ROCK'S. 
Plast-e. 
Fiiooul.-i in Malvern sandstone, Sil p.lOO. 
ZooriiYTA. 
Favositi's GothlanJicus, Lam. S. S. 082. Nobulipor.i. 
alveolaris, iihiino. Man. 402. Palseocylus porpita, T.inn. ?p. 
Goniopbyllum pyianiidalo, His. l.ith. I'etiaia U'ljuisulcata, M'Coi/, P. F. ."iO. 
Holiolitos intcnstinctus, W'dld. bina, /'/,//. P. F. 4. Sil. 242. 
(I'd/ites pyrij'onnis, Sil. Syst.) elongata, Phil P. F. fi. 
subtilis, M'Co'y, P. F. 17. snbduplicata, If Coy, P. F. 40. 
tubulatus, Lovs. S. S. ()87. Syringopora serpens, Goldf. S. S. (ITS. 
Halysitcs catenularius. Linn, Sil. 085. Graptolitluis priodon, Bronn. 
i Calcniponi cscharoidcs) {fJ. [Aidensix, S. S. p. 094.) 
EririNODERJIATA. 
Plourccystites Rugeri, Salt. Sil. p. 229. CrinoiJ stem?, Sil. PI. ID. f. 1. 
Crustacea. 
{Eiitomoslraca — Trilolites) Liclias laxatus, M' Coy, S. F. 51. 
Acidaspis Brightii, March. S. S. 658. Chcirurus bimucronatus, Murch. S. S. 
Asaphus latifrons, PortL (j. R. 292. 377. 
(Slyyinu, Stdici:) Phacops caudatus, S. S. 654. 
Puraastus Barriensis, March. S.S. 050. Povvningire, March. S. S. 055. 
Oypliappis megalf.ps, M'Coy,sp. P.F.14:j. Stolicsii, Eda: S. S. 050. 
(;alynipneBlumenI)3cliii, /)/-o«f/.S.S.05;J. Weavci i. Salt. Dec. 2, p. 7. 
Encrinurus punctatus, Ih 'iinn. Sil. 230. Proetus latifrons, M'Coy, S. F. 40. 
lllasnus Bowman!, Sidt. (r. S. 2, p. 339. Pterygotus spec. Sil. 100, 235. 
AXXELIDA. 
Coruulito!? scrpularius, ,SV/,/. S. 027. Tentaculitc.i ornatus, Svv. S.S. 028. 
Tontaculitcsanglicus, Salt. Sil. t. 1. f. 3. 
I'r.YOZOA. 
? Nidiilites favn.«, Sail. Sil. 20:;. Ptilodictya lanceol.ata, T.onf. S. S. 070. 
Ptilodiotya diclK.tomn, I'^rll. li. \\. 339. scalpellum, Lcn-f. S. S. 070. 
