ON EXCAVATIONS IN THE PALASOZOIC ROCKS OF WALES, ETC. 141 
(B)—From tay IxctopEp Brocks. 
Callavia Callavei (Lapworth). ; 
Micmacca (2) ellipsocephaloides, var. senior (Cobbold). 
“a 3 var. strenuelloides (Cobbold), 
Microdiscus, sp., cf. M. Helena (Walcott). 
Ptychoparia (7) attleborensis (S. and F.). 
Kutorgina cingulata (Billings) ? 
Linnarssonia, sp. 
Lingulella, sp.- 
There is often considerable difficulty in deciding whether any par- 
ticular fossil belongs to the matrix or is part of an included block. As 
a rule the state of preservation is a guide. The Paraduzides and 
associated species generally occur as well-preserved casts of a red, 
yellow, or rusty colour, or, where the test is preserved, of a slaty grey, 
but sometimes they are whitish. The fragments of Callavia and its 
associates often have a white egg-shell texture, exactly similar to those 
found in the Olenellus-Limestone of the Quarry, but they also occur as 
brown ferruginous casts. 
Hxcavation No. 50, Comley Brook, South-west Slope. 
A little tributary hollow joins the course of the Brook just above 
Excavation No. 49, and beyond it is another shoulder of rock almost 
entirely covered with herbage. A trench about 18 yards long on this 
ground disclosed a thickness of about 20 feet of green sandstones with 
a dip of about 45° towards 20° south of west. 
Some of the beds of sandstone are very soft, others are harder and 
flaggy, with white silky partings and indistinct tracks of organisms. 
Notwithstanding the length of this trench the Breccia bed of No. 49 
was not encountered, and further elongation was impossible on account 
of the growing crop. 
I refer these beds to the Lower Comley Sandstone. 
Excavation No. 51, Francis’ Field. 
Several trials were made along the line of the western fence to 
Francis’ Field near Excavation No. 27 (see map, Sheffield Report). 
One of these disclosed a thick band of rather coarse grit, with a dip of 
45° towards 18° south of east. The following is the full section in 
descending order :— 
Ft. 
(a) Brownish shales, with hard micaceous sandy bands, top not seen. 
Fossils, Acrotreta, sp., and an ostracod P 2 ; . 
(6) Yellowish grit, with some small pebbles of quartz and some 
patches of dark brown rottenstone . - : : : sale 
(c) Brownish shale, base not seen : 1 
The easterly dip of these beds is so different from that shown in the 
Excavations Nos. 47 to 50, that it is evident that we have passed out of 
the region of Dairy Hill domical fold and have touched beds which 
are probably superior to those of the Hill House Ridge (Excavation 
No. 5, see Dublin Report, 1908). 
