Current Action in the Ordocician. — Ruedeinann. 369 
Bed with prevailing spicules, some shells of Endoceras and CUma- 
cograptus, gathered in patches. Bearing, N. 50 degrees E. 
Calcareous bed. 
6. Many layers densely covered with fragments of Tridrthrus. Bear- 
ing, due east. 
Two beds with Cliiiiacor/raptus. Bearing, due eaat. Sicular ends, W. 
Layer with Triarthrus fragments, Cliinacograptua and Eadocevdn. 
Bearing, N.. 70 degrees east. Apices of Endoceras and sicular ends of 
Cliinaco(j)aptns E. (li rJndoceras shells E., none W.) 
Layer with the same fossils, but 8 Endoceras W., 3 E. The numer- 
ous sponge spicules and Endoceras shells in this layer are directed N. 
70 degrees E., while the rhabdosomes of the graptolites are parallel to 
N. 15 degrees E. The appearance of this layer, which is exposed over 
a large surface, suggests the directing action of two successive motions 
of water of different strength. 
Layer with Endoceras and Cliniacograptus. Bearing, N. 70 degrees 
E. The apices of the £'u(Zoocr«.s shells point east (41 E.. 3 W.): those 
of Cliniacograptus in both directions. 
Numei-ous layers with trilobite fragments and rhabdosomes of C/i- 
niacograptas. Bearing. N. 85 degrees E. Sicular ends in both direc- 
tions. 
Layer with spicules, N. 85 degrees E. 
Numerous layers with trilobite fragments. Bearing, N. 85 degrees E. 
Layers with Triarthrus fragments, spicules and long drift-ridges of 
fragments of Diplograptus pristis and Lingida. Bearing, N. 80 degrees 
E. 
Layer with spicules and shells of £'j«ioc(.'rrts. No distinct direction. 
Bed of calcareous shale. This bed is covered with projections, each 
consisting of a round nucleus from which proceeds a gradually broad- 
ening and flattening ridge. The bearing of these ridges is N. 80 90 de- 
grees E., the nuclei being towards the east. The latter generally 
contain some small fossil, usually a gasteropod. It is evident that the 
ridges result from the depositicm of tine calcareous mud behind the 
shells, and, therefore, allow the inference that the water came from 
N. 80-90 degrees E. 
7. Numerous layers with sponge spicules. Bearing, N. GO degrees E. 
Layer with furrows, as from flowing mud, running N. (10 degrees E.- 
S. 60 degrees W. 
Layer with Triarthrus fragments, crinoid joints, and sponge spicules. 
Bearing N. 60 degrees E. 
Eight layers with sponge spicules and rhabdosomes of Cfiniacograp- 
tus. Bearing, N. 70 degrees E. 
Layer with Cliniacograptus bicornis and Endoceras. l^earing, N. 65 
degrees E. Apices of Endoceras shells E. 
Five sponge beds. Bearing, N. 75 degrees E. 
Two layers with Triartltrus fragments and Endoceras shells. Bear- 
ing, N. 80 degrees E. All E ndoceras .shells point E. 
Six sponge beds. Bearing, N. 55-70 degrees E. 
