484 W. J. SOLLAS ON THE SILURIAN DISTRICT 
ft. in. 
Brought forward igeresteses concer sees aee er aeeece accesses 14 0 
11. Rusty-red muddy and concretionary bed, calcareous and full of 
fossils,of£ Wenlock age!) civsccisss.mocs adeeeeteseensnene bee ac asccceenee 2 0 
12. Alternations of compact and flagey sandstones ..............sceeseeeee 1 8 
13. Fine-grained, compact, argillaceous, claret-coloured sandstone ... O 11 
14. Alternations of flaggy and compact sandstones and mudstones, 
greenish orey, {h.cssss dba ec nsbewacessseeaeRcer eee Me ewe sen ee aceee 10 7 
15. Greenish-grey shales, with lenticular patches of limestoneand fossils O 9 
16. Thin-bedded sandstone and shales, fossiliferous in places............ ie) 
eelenticularspabchesyotpliniestouelsaceesteste sce eReee tee eee eereeceneeee Oe, 
18. Greenish-grey fossiliferous shales................2scscecreceenecescnces e+ 0 8 
19. Thin bed of impure crystalline magnesian limestone, yellowish 
grey, full of casts of fossils, especially of Pentamerus levis ... O 3 
20. Greenish-erey flaggy sandstone and mudstone ...........-.c0eeeeeee ee 0 9 
21. Calcareous sandstone, full of branching Favosites fibrosus, which 
weathers into worm-like holes on the surface .................-+-+ 0 2 
22. Alternations of greenish-grey mudstones and flagstones, with occa- 
sional lenticular patches of limestone..............0.:eeeeeneeeeeeeees 10 5 
Total thickness ....... noosdoseaneoaoane 44 1 
The flagey sandstones and mudstones of this series are mostly 
more or less micaceous. 
The most important beds are those numbered 10,11, and 19. The 
first two are the most fossiliferous beds in the neighbourhood; and 
I obtained, in company with Mr. Ross, the following species, most of 
which have been named by Mr. Etheridge. 
Fossils from the Beds 10 and 11 in the Cae-Castell Section. 
Llandovery.| Wenlock. | Ludlow. 
Cystiphyllum cylindricum, Lonsd....... 
Heliolites interstinctus, Wahl. ......... 
———— innlonllannnict IGS ocogs000a7c900000006 
Omphyma turbinata, Linn. ........-..00-- 
Syringopora bifurcata, Lons. ............ 
—- fascicularis, #. & H. ...........00- 
Favosites gothlandicus, Linn. ......... 
=== Morass), Gro concotccssobounnssesoon 
Halysites catenularius, Linn. ............ 
Diastopora consimilis, Lonsd. Llandeilo. 
Bellerophon wenlockensis, Sow. ......... 
Euomphalus sculptus, Sow........ eonoade. 
THObaNODEL SOME - scsooononncdsane Borneo 
Eunema cirrhosum, Sow.......:.s.eeeeess 
Acroculia haliotis, Sow. ........0:s00.006- 
Mytilus mytilimeris, Conr................ 
Pentamerus galeatus, Dalm. ...........- 
Stricklandinia lirata?, Sow. .........05- 
Atrypa reticularis, Linn.:......s0.cce000 
Rhynchonella Wilsoni, Sow. ............ 
borealis Schiae aces eeeee sc eeee scat 
Strophomena euglypha, Dalm. ......... 
Orthis elegantula, Dalim. .........s.10000-+ 
Orthoceras angulatum, Wahl............. 
Phacops caudatus, Briinn. ....... cooda00 
Calymene Blumenbachii, Brongn. ...... 
Illenus barriensis, Murch. .......6. 0000 
Tentaculites ornatus, Sow. ......scc00000: 
* 
> 
* % OK 
mK 
2K 
KK XK KK KK %K 
TKK XK OK 
x 
OK KK OK 
KK OOK OK KOK OK OK OK RK OK OK OK 
*K 
KOK KOK OK OK OK OK OK OK XK 
