270 Geology and Mineralogy of the 
jasper,* red, green, ash, and greenish brown and black, e1 
ther uniform, or in stripes and clouds. The first and last 
of these species often run into each other. 
The greenstone conglomerates are also of three kinds— 
that of quartz nodules, of the granitous compound, of the 
“ Serpent rock,” and of greenstone nodules. 
Breccias of the same osebabeere with these conglome- 
rates are not uncommon. 
Near Collier’s Harbour and on an islet near the Grand 
Manitou a curious mineral occurs in rolled fragments of close 
pont 
“Itis in the form of octohedral crystals with rounded edg- 
s—one specimen was found three inches in length and two 
and a half in breadth. A section discovers the following 
appearances. The external coating is a slender layer of 
co part -~ mica in ig ee arranged frag- 
where, howev y disappear in the form of a whitish 
yellow saci “TSec plate, fig. 4 
The organic remains of the limestone of St. Joseph in- 
clude numerous and very extraordinary appearances similar 
to what Dr. Lloyd of Oxford in his Ichnographia calls Al- 
veoli—cylindrical tubes or cases, of various sizes—sometimes 
giving 0} branches,—belemnites, coralites, impressions of 
weeds, four species of entrocite, five of bivalves, trochites 
and turbinites.t There are also, honey comb and chain 
madrepores, and many singular impressions &c. which are 
perhaps non-descript; but no adequate idea can be formed 
of them without accompanying sketches. 
wing No. 5, is one fourth of the size of a relic ta- 
ken from a small island off the river Thessalon on the north 
coast of Lake Huron. It was found imbedded in a large 
fragment of limestone. The raised and more perfect por- 
tion is ach above the matrix, one and a half ces 
pater <hecamacant.: the delin- 
* In some rar 4h jasper, in- 
an ie Saeed Spr previous to the formation of the 
+The sellin Lake Huron, a present existing, ‘attiaghee: taint, 
cochlites, turbinites and various bivalves. a r 
* 
