Note 78 — PART III.

Mayer-Eymar, Quelques mots sur les nouvelles recherches relatives au Ligurien et au Tongrien d’Egypte. Bull. de l’Inst. Egypt. (3) N. 4, 1894. Mayer-Eymar’s division of the lower beds into Ligurien inférieur and Ligurien supérieur is hardly convincing, especially as no fossils were found by that observer. The correlation of strata in widely separate areas by their lithological similarity is at least open to question, especially with beds of this type, which can indeed be exactly matched again and again at many levels in the same vertical succession. His diagnosis of the beds immediately below the basalt as Tongrien inférieur, rests, however, on firmer grounds, as this basalt sheet can be traced across the desert to beyond the latitude of Cairo, and is probably everywhere of approximately the same age.