phosphorites

Around 85% of phosphate fertilizers produced today come from phosphorites and sedimentary phosphate mineralizations which are comprised of fine mineral crystallises.

Chapter 20 1993

A direct feed of raw mineral is frequently not practical due to the relatively low solubility of untreated phosphorites.

Chapter 20 1993

In the remarkable memoir on the phosphorites of Quercy, to which I have referred, M. Filhol describes no fewer than seventeen varieties of the genus _Cynodictis_, which fill up all the interval between the viverine animals and the bear-like dog _Amphicyon_; nor do I know any solid ground of objection to the supposition that, in this _Cynodictis-Amphicyon_ group, we have the stock whence all the Viveridæ, Felidæ, Hyænidæ, Canidæ, and perhaps the

Darwiniana : Essays — Volume 02 Thomas Henry Huxley 1860

Territories of America, have appeared almost wholly since 1870, those of M. Filhol on the phosphorites of Quercy in 1878.

Darwiniana : Essays — Volume 02 Thomas Henry Huxley 1860

"During the epoch of the phosphorites, great changes took place in animal forms, and almost the same types as those which now exist became defined from one another.

Darwiniana : Essays — Volume 02 Thomas Henry Huxley 1860