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In the letter above quoted, he even named the species he expected to find most prevalent in those greater depths: as, for instance, representatives of the older forms of Ganoids and Selachians; Cephalopods, resembling the more ancient chambered shells; Gasteropods, recalling the tertiary and cretaceous types; and Acephala, resembling those of the jurassic and cretaceous formations.
The lower is called the MISSISSIPPIAN, from the outcrop of its formations along the Mississippi River in central and southern Illinois and the adjacent portions of Iowa and Missouri. The upper series is named the PERMIAN, from the province of Perm in Russia.
Arriving at the other side, we continued to go down corridor after corridor, sometimes descending, sometimes mounting flights of steps, always seeing nothing but salt salt salt. In one place, artificially lighted, there are exhibited all the curious formations of salt, with their beautiful crystals and varied colours.
In places the artist evidently stood on some elevation of wood or stone, for the carving was higher than the average man could reach. Along a crest of sandstone I saw some very odd formations; they looked like huge inverted cones, that some giant sculptor had carved there.
They are not only more ancient than the fossiliferous Cambrian formations above described, but are older than the Huronian last mentioned, and had undergone great disturbing movements before the Potsdam sandstone and the other "primordial" or Cambrian rocks were formed. The older half of this Laurentian series is unconformable to the newer portion of the same.
The central and western parts of the island contain two formations of compact limestone; one of clayey sandstone and another of gypsum. The former has, in its aspect and composition, some resemblance to the Jura formation. Yellowish cavernous strata, with cavities from three to four inches in diameter, alternate with strata altogether compact,* and poorer in petrifications.
In following the analysis of the dream we have made some progress toward an understanding of the composition of this most marvelous and most mysterious of instruments; to be sure, we have not gone very far, but enough of a beginning has been made to allow us to advance from other so-called pathological formations further into the analysis of the unconscious.
Such erratics have evidently been moved bodily from their original site, probably by the same glacial action which has polished and striated some of the accompanying granitic and other boulders, occasionally six feet in diameter, which are imbedded in the drift. Intervening between these glacial formations and the subjacent chalk lies what has been called the Cromer Forest-bed.
The lower beds of the gypseous formation resemble the corresponding and probably contemporaneous strata of the main Cordillera; whilst the upper beds in several respects resemble those of the Uspallata chain, and possibly may be contemporaneous with them; for I have endeavoured to show that the Uspallata beds were accumulated subsequently to the gypseous or Neocomian formations of the Cordillera.
On the coast of this inland sea, especially on the western islands, large coral formations have grown, changing what was originally narrow mountain chains, running north and south, to larger islands.
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