240 C. LAPWORTH ON THE MOFFAT SERIES. 



19. The Moffat Series. By Charles Lapworth, Esq., F.G.S. 

 (Read Nov. 21st, 1877.) 



[Plates XI.-XIIL] 



Contents. 



Introduction. 



I. General characters of the Lower Silurian Rocks of the south of Scotland. 



II. General characters of the strata of the Moffat district . 

 III. History of previous opinion. 



A. Physical Relations of the Moffat Series. 



I. Description of the typical sections of Dobb's Linn and Oraigmichan Scaurs. 

 II. Description of the black bands to the south of the Moffat Valley. 



(a) Black-shale bands south-west of St. Mary's Loch. 



i. Muckra Band ; ii. Biskinhope Band ; hi. Whitehope Band ; 

 iv. Berrybush Band. 



(b) Black bands in the valley of the Yarrow. 



i. Mount-Benger Burn ; ii. Eldinhope. 



(c) Black band of Ettrick and Glenkiln. 



i. Ettrick; ii. Entertrona; iii. Belcraig ; iv. Glenkiln. 

 III. Description of the sections of the Moffat Series to the north of the Moffat- 

 Yarrow Valley. 



(a) Basin of the Upper Annan. 



i. Frenchland Burn ; ii. Garple Spa ; iii. Rittonsicle ; iv. Head- 

 shaw Linn ; v. Hartfell Spa. 



(b) Basin of the Meggat Water. 

 (<?) Basin of the Moffat Water. 



IV. Summary of observations and conclusions regarding the physical relations 

 of the Moffat Series. 



B. Subdivisions, Lithology, and Palaeontology of the Moffat Series. 

 I. The Glenkiln Shales. 



II. The Hartfell Shales. 



(a) Lower Hartfell. 



i. Zone of Climatograptus Wilsoni ; ii. Zone of Dicranograptus 

 Glinqani ; iii. Zone of Pleurograptus linearis. 



(b) Upper Hartfell. 



i. Barren Mudstones ; ii. Zone of Dicellograptus anceps. 



III. The Birkhill Shales. 



(a) Lower Birkhill. 



i. Zone of Diplograptus acuminatus; ii. Zone of Diplograptus 

 vesiculosus ; iii. Zone of Monograptus gregarius. 



(b) Upper Birkhill. 



i. Zone of Dlplograptus comeia ; ii. Zone of Monograptus spini- 

 gerus ; iii. Zone of Rastrites maximus. 

 Table showing the vertical distribution of the Fossils of the Moffat Series. 



0. Conclusion. 

 I. Systematic importance of the divisions of the Moffat Series. 

 II. Comparison of the Faunas of the three divisions of the Moffat Series with 

 those of their foreign equivalents. 

 (a) Llandeilo Formation ; (b) Bala or Caradoc ; (c) Lower Llandovery. 

 III. General conclusions as to the geological age and relationships of the Moffat 



Series. 

 IV. Bearing of the foregoing conclusions upon the general question of the suc- 

 cession among the Silurian Rocks of the south of Scotland. 



