664 EEPOET— 1886. 



The following gives the results of further work, the beds being enumerated in 

 ascending order : — 



1 . Bala beds = zone of Dicellograptus anceps (Nich.), containing besides this fossil 

 T)iplograptus cf. pristis (His.), Trinucleus seticornis (His.), Dindymene ornata 

 (Linn. ?), Cylele Loveni, (Linn.), &c. 



These beds show resemblances to Swedish Trinucleus shales. 



2. Stockdale Shales. Beds of this age are a conglomerate, succeeded by a few 

 inches of leaden blue shales, and four inches of calcareous rock with Phacojis 

 elegans, &c. The supposed pale shales formerly described are weathered beds of 

 the next series. 



3. Lower Coniston Flags, zone of Monogrnjytus priodo7i, with M. personatus 

 (Tullb. ?), and Retiolites Geinitzianus (Barr.) 



4. Austzvick Pits, apparently unfossiliferous. 



5. Upper Coniston Flags, seen at Studrigg, and in Arco wood. Combes, and 

 Dryrigg quarries. Zone of Monograptus colomis (Barr.) contains also M. bohemicus, 

 (Barr.) and M. Rwmeri (Barr.), with numerous other fossils. 



The succession is quite similar to that in the Lake District and elsewhere, but 

 the Birkhill graptolitic fauna is entirely absent, and the conglomerate and Phacops 

 elegans zone perhaps represent only the upper part of the Stockdale shales (Pale 

 slates). 



7. Note on a Bed of Bed Chalk in the Lower Chalk of Suffolk.^ 

 Bg A. J. Jukes-Bkowne, B.A., F.G.S. 



The section exposing this stratum was discovered during an excursion made 

 last June by Mr. W. Hill, F.G.S. , and the author. It occurs in a quarry near 

 West Bow Ferr}-, about two miles west of Mildenliall ; here a band of red marly 

 chalk is seen near the entrance, dipping westward at a low angle, but soon 

 becoming horizontal and running along the whole face of the quarry. 



As seen in the centre of the quarry, the band consists of marly chalk, which is 

 brick red at the top, pink in the middle, with a base of grey marly chalk containing 

 bard lumps or nodules ; the whole being about 5 feet thick, and resting on a bed of 

 hard nodular grey chalk, below which alternating beds of hard and softer grey 

 chalk are seen for 14 feet. 



The quarry lies between the outcrops of the Totternhoe Stone and the Melbourn 

 Bock, and is opened in a shallow synclinal trough, so that there must be a second 

 outcrop with an easterly dip along a line nearer to Mildenhall, but of this no 

 indication was found. The horizon of the red band is considered to be about the 

 centre of the zone of Holaster subglubosus, and to be at least 100 feet above the base 

 of the chalk marl. It is clear, therefore, that it has no connection whatever with 

 the red rock which forms the base of the chalk at Hunstanton and in Lincolnshire. 



It is well known, however, that the Lower Chalk of Lincolnshire contains two 

 other bands of red chalk, and the author's examination of this district for the 

 Geological Survey enables him to compare the Suflblk and Lincolnshire sections in 

 detail. The West Bow bed closely resembles the lower of the two red bands which 

 are seen in the quarries near Louth, and as this occurs very nearly on the same 

 horizon, ho has little hesitation in correlating them with one another as homotaxial 

 beds, though they may not be identical, because they do not appear to be con- 

 tinuous across the intervening space in Norfolk and Lincolnshire. 



No other exposure of this red chalk was found in Suffolk, and in the north of 

 that county the whole of the Lower Chalk lies beneath the Fens. It is brought up 

 again by a fault on the north side of the Brandon Biver, and the outcrop of the 

 same red chalk was seen in tiie bank of a dry pond at Feltwell St. Mary, in 

 Norfolk, so that the band is in all probabilitv continuous between Mildenhall and 

 Feltwell. 



' Published in the Geol. Mag. Dec. 3, vol. iv. p. 2i, 1887. 



