520 Notices of Memoirs—Dr. J. D. Falconer on N. Nigeria. 
phyllites, schists, and gneisses of sedimentary origin with associated 
amphibolites, hornblende schists, and other more or less metamorphosed 
igneous rocks. The two series, which were probably originally 
unconformable, have been folded together along axes which are 
predominantly meridional in direction. They have also been pierced 
by numerous igneous intrusions, which are readily subdivided into an 
older and a younger group. The older group consists principally of 
granites, wholly or partially foliated, which have been affected to 
a varying extent by the forces which produced the metamorphism of 
the gneisses and schists. The members of the younger group are 
non-foliated, and include such types as tourmaline granite, riebeckite 
granite, augite syenite, augite diorite, and numerous associated 
dyke rocks. 
Rocks of Cretaceous age are found in the valleys of the Benue and 
the Gongola and in the angle between the two rivers. They are 
invariably gently folded and sometimes broken and faulted, and consist 
of a lower series of sandstones and grits, in part salt-bearing, and an 
upper series of limestones and shales, with numerous fossils of 
Turonian age. The post-Cretaceous rocks, which rest unconformably 
upon the Cretaceous Limestone, and are probably all of Eocene age, 
occur over three detached areas: (1) in Sokoto Province and the 
Niger Valley, (2) in Bauchi and Bornu, and (3) in Yola. The Sokoto 
Series, which contains marine intercalations yielding abundant Eocene 
fossils, is continuous southward with the sandstones, grits, and 
ironstones of the Niger Valley. The correlation of the sandstones, 
grits, and clays of Bauchi, Bornu, and Yola with the Eocene rocks of 
Sokoto and the Niger Valley is based partly upon lithological 
similarities and partly upon the absence of evidence of any extensive 
post-Eocene submergence of the Protectorate. 
Extensive fields of basaltic lava occur in Southern Bornu and on 
the borders of Bauchi and Nassarawa ; and numerous puys of trachyte, 
phonolite, olivine basalt, and nepheline basalt are distributed through- 
out Southern Bauchi, Muri, and Yola. The puys and lava-fields alike 
are the product of Tertiary volcanic activity. 
During the latter part of the Tertiary period there appear to have 
been repeated minor oscillations of the crust, which culminated in the 
elevation of the Bauchi plateau and the Nassarawa tableland, the 
depression of the Chad area, and the establishment of the present 
river system. 
IV.—Tse Occurrence or Marine Banps at Matrsy. By Ww. H. 
Dyson.! 
Wyre the sinking operations at Maltby the writer has located 
the stratigraphical position of the fossils found and has 
inspected the excavated debris day by day. Although all fossils 
have been collected, reference is only here made to the marine bands. 
Taking the top of the Barnsley Coal (2452ft. 2in. deep or 
1 Read before the British Association Meeting, Sheftield, 1910 (Section C). 
Ee 
