HEN SLOW ON CONCRETIONS IN THE CRAG. 35 



fossil plants. As these upper red sandstones have, however, been 

 confounded with the gypsiferous formation, some of whose sand- 

 stones they often much resemble, I may shortly describe a section 

 on the Waugh's and French rivers of Tatmagouche, exhibiting a 

 portion of them, and at the same time illustrating the structure of 

 a part of the Cobequid chain. 



At the mouth of the French river are grey sandstones and 

 shales, containing a few endogenites, calamites, and pieces of lignite, 

 impregnated with copper ores. Beneath these appears a series of 

 brownish-red sandstones and shales, with a few grey beds, occu- 

 pying, in a regular descending series, about six miles of the river 

 section. They contain, in a few places, nodules of copper glance, 

 they are often rippled, and contain branching fucoidal marks. On one 

 of the rippled slabs I found marks consisting of four foot-prints of 

 an animal. These were three inches and a-half apart, and each 

 exhibited three straight marks, as if of claws. * 



The dips of these sandstones gradually increase in approaching 

 the hills, and the lowest seen is a bed of grey sandstone, dipping 

 at an angle Of 30°. There is then a small break in the sections, 

 succeeded by hard dark shales and slates, and hard brown grits, 

 with a bed of limestone in which I could find no fossils, except 

 a fragment of a Productus and a few fragments of encrinital stems 

 in bad preservation. These rocks are much disturbed, but gene- 

 rally appear to dip at high angles to the northward. They are 

 associated with masses of greenstone, amygdaloid, reddish syenite, 

 and other igneous rocks. They appear to rise unconformably from 

 beneath the sandstones of the low country ; but whether they 

 belong to the lower carboniferous or to some older system, I cannot 

 at present determine. 



I hope, at some future time, to be able more particularly to state 

 the structure and relations of the newer members of the coal 

 formation, but have not yet collected a sufficient quantity of facts 

 to determine accurately their relations. 



The horizontal red sandstone of Truro, which skirts the Basin of 

 Mines, has no connection with the red sandstone of Tatmagouche, 

 but is probably newer than any part of the coal formation. It is 

 destitute of the grey sandstones and shales, and in several sections 

 of it which I have examined, I have not found any fossils. 



3. On Concretions in the Red Crag at Felixstow, Suffolk. 

 By the Rev. J. S. Henslow, M.A., F.G-.S., Professor of Botany 

 in the University of Cambridge. 



I place on the table a selection from a large assortment of a 

 peculiar description of concretions obtained from the Red Crag at 



* These tracks resemble the marks of the claws of an animal running over a 

 moderately firm surface, or climbing up an inclined plane. They are not unlike 

 the marks left by the claws of small individuals of the River Tortoise on the 

 sides of mud banks, but differ from them in showing traces of two feet only. 



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