Review of Recent Geological Literature. 187 
REVIEW OF RECENT GEOLOGICAL 
LITERATURE. 
Ueber cambrische und silurinche PJiospho7'itfUhrende Gesteine aus 
Schiceden, von Johan Gunuar Andersson (Bull. Geol. Instit. of Upsala, 
No. 4, vol. ir. Part 2, 1895.) Under the above title Herr Andersson gives 
a very full account of the various deposits of phosphate rock found in 
Sweden, with the geological age, conditions and mode of occurrence of 
this substance at the several horizons where it has been found to exist. 
The literature of the subject is fully treated, beginning with the dis- 
coveries in Dalecarlia and Westgotland in 1870, and continuing with 
those in ffiland, Schoren, Nerike. Angermanland. Norbotten, East Got- 
land, etc. Various well known Swedish geologists have taken part in, 
and discussed these discoveries. 
The phosphate deposits have been found at several horizons, the old- 
est being in the Lower Cambrian in several districts, viz.: Gotland, 
(Eland and Gotska Sandon, the next the Middle and Upper Cambrian 
at CEland, Horn and Dalecarlia.- The third horizon is at the base of 
the Ordovician in Nerike, Wambe, CEland, etc. 
From an examination of the phosphate nodules of the base of the Or- 
dovician, which he affirms to constitute a conglomerate, Herr Andersson 
concludes that this is not an original deposit of phosphatic material, 
but consists of rolled fragments derived from the Upper Cambrian 
alum slates beneath. This is shown by the fragments of various species 
of Cambrian trilobites contained in these phosphate nodules (Petura 
Sphoerophthalmus. Ctenopyge, etc.) 
On the other hand, he considers that the phosphate is indigenous in 
the Cambrian horizons. The oldest Lower Cambrian jjhosphate zone, 
he calls the Torellella kcvigata. (formerly HyoUtes I.) conglomerate. 
Miclivntzia (formerly Obolus) monilifera is said to occur with the 
Torellella and it is shown to lie above Olenellus (now Hohnia) kjerulfl,. 
The phosphate horizon in the Middle and Upper Cambrian is called 
the Acrothele gran ulata conglomerate, and contains a variety of fossils, 
chiefly those of the "Middle" Cambrian, with one or two from the 
Lower Cambrian and several from the Upper. It appears therefore, to 
have accunuilated at some localities during much of the Cambrian age. 
Among the conclusions which Herr Andersson bases on his study of 
the Swedish Cambrian bed, are the following: Wherever, in the Swed- 
ish Cambrian — Silurian, narrow shoi-e-deposits are met with, we find 
also numerous occurrences of phosphatic nodules. The Lower Cajn- 
brian Torellella-heariag conglomerate, the Obolus conglomerate in 
Dalecarlia and the Island of CEland, together with the Lower Silurian 
Strophomeno, jeutzschi conglomerate are apparently phosphatic beds 
of an undoubted littoral nature. Speaking of the glauconite which ap- 
pears in the Str. Jeatzschi horizon, the phosphate-bearing shallow-sea 
layers contain masses of glauconite grains, while the glauconite played 
a subordinate part in the littoral phosphate bearing deposit. This oc- 
