Lower Palceozoic Rocks of Haverfordwest. 209 



trinodus, Salt, Trinucleus seticornis, His., Stygina latifrons, Parti. , 

 Phillipsia parabola, Barr., Cheirurus parvus, Salt., Encrinurus sex- 

 costatus, Salt., Phacops Brongniarti, PortL, &c. 



(b) Redhill beds, blue-grey shales, generally poor in fossils, but 

 containing here and there a fair abundance, especially of Plmcops 

 Brongniarti, PortL, and Trinucleus Bucllandi, Barr., and many 

 Lamellibranchs and Gasteropods. 



(c) Slade beds, consisting of gritty green shales with calcareous 

 bands crowded with fossils. Glauconome disticha, Phyllopora Hisin- 

 geri, McCoy, Phacops Brongniarti, Port!., Trinucleus seticornis, His., 

 Calymene trinucleina, Linn., Orthis testudinaria, Dalm., are abundant. 

 Climacograptus, sp., also occurs. 



vi. Conglomerate, containing many quartz pebbles, succeeds the 

 beds of the Slade stage in many localities, and does not seem to 

 mark a great discordance, as the authors have nowhere found it 

 resting on lower beds. 



vii. Lower Llandovery beds. Green gritty shales, with grit and 

 very fossiliferous calcareous bands, characterized especially by Nidu- 

 lites favus, Petraia subduplicata, var. crenidata, StricJchmdinia 

 lirata, &c, and containing Phacops elegans, Bceck and Sars, Phacops 

 mucronatus, Ang., and Deiphon Forbesi, Barr. 



The authors attempted a correlation of the Haverfordwest rocks 

 with those of other areas : — 



Conglomerate and grit of Trefgarn = Harlech ? 



Lingula Flags of Trefgarn &c. =Dolgelly beds. 



Didymograptus shales =Llanvirn. 



Llandeilo Limestone = Lower Bala. 



Dicranograptus shales = Lower and Middle Bala. 



Robeston Wathen Limestone =Bala Limestone. 



Trinucleus-seticomis beds = Upper Bala. 



Conglomerate 1 — T M H'll 



T?rkasnlifArrm<a T.nwAr T.lnnrlnvprv Viprla I * 



Fossiliferous Lower Llandovery beds 



In conclusion the authors notice two points which require further 

 elucidation. The first is the separation of the Robeston Wathen 

 and Sholeshook limestone. This is made on palasontological and 

 lithological grounds, as the whole thickness of the two limestones 

 had nowhere been met with in the same section. The second is the 

 relationship of the conglomerate to the fossiliferous Lower Llandovery 

 beds. In the only place where the two appear in juxtaposition the 

 conglomerate series appears to underlie the fossiliferous Llandovery 

 beds ; this the authors explained by a faulted overfold. These dif- 

 ficulties do not, however, prevent the authors from hoping that the 

 sequence they have established will be of use in assisting to deter- 

 mine the character of the very remarkable folds by which the district 

 has been affected. 



3. " On certain Fossiliferous Modules and Fragments of Haematite 

 (sometimes Magnetite) from the (so-called) Permian Breccias of Lei- 

 cestershire and South Derbyshire." By W. S. Gresley, Esq., F.G.S. 



In this paper the author described certain pebbles of lueniatite 



Phil. Mag. S. 5. Vol 20. No. 123. August 1885. P 



