73 
^ceiye(j from Mr. Clarke only generic names, as follow : — Nucula, Fenestella, Solarium, 
P^rifera, Orthonota, Fdnondia, Stenopora, and Producta. In an Appendix * to Mr. 
j. ^I’ke’s work, Prof. De Koninck added Spirifer Strzeleohii, De Kon., to the Gympie 
_ In the Chapter on the Devonian Eocks I have already given my reason for trans- 
erring large areas of the rocks hitherto regarded as Devonian to the Gympie Formation. 
an example of extreme metamorphism of stratified rocks, presumably of the Gympie 
oriuation, Mr. Samuel Stutchbury’s description f of the Glasshouse Mountains in 
oreton Bay may be quoted in this place. 
‘ The special forms and characteristics which the Glasshouse Mountains present 
“ peculiarly interesting. At first sight, band sjiecimens might be taken for a fine- 
S^ained granite ; but on examining these en masse and carefully viewing all the 
It circumstances, there can be no doubt that they are metamorphic sandstones, 
w evident that no granite masses could have been projected in the fonn they now 
they must have been surrounded by some supporting material such as the 
^Ktinuatiou or extension of the same strata would give, now removed by denudation, 
pen careful examination lines of stratification can yet be traced. The largest of the 
untains, ‘Beerwah,’ presents ^precipitous faces, especially on the northern and 
ern sides, exhibiting scmi-basaltic columns leaning from the base towards the centre, 
sandstone rock adjacent is, in many instances, composed of minute crystals of 
Tiartz, each crystal being slightly abraded. In other instances it contains mica (similar 
wl Sandstone and Pennant Grits at home), and much ferruginous matter; 
st Beerwah itself appears in composition, as already stated, like a grauitell with a 
y of albite superadded.” . . . “We can easily imagine that at a period 
j ^^fiPiont to the Coal Measures there were as many foci of heat as there are now 
Utaing^ withniit the nvTnrrenoiis rocks bavin.o' the nower to burst throuffh the 
, without the pyrogenous rocks having the power to burst throug. 
strata of sandstone (Beerwah being from 700 to 800 feet above the level 
^ ® plain upon which it stands), but sufficient, by their heat, to induce a nieta- 
cai • superincumbent sandstone, giving origin to the crystals of felspar, and 
^ solidification of the material, which has to a degree protected it ; while those 
obs unchanged surrounding sandstones have been removed to the extent 
“reed between the level of the plains and the tops of the existing mountains.” 
Hon same inonutains have, however, been described by a later observer, the 
• 0. Gregory,^ as “ remarkable outbursts of porphyritic rocks.” 
The late Mr. D’Oyly H. Aplin noted in 1867 § the occurrence of branched corals 
stems at Elbow Creek, Lucky Yalley, in blue slates, within a series of 
calea 
^aie ^^^‘istones, and calcareous grits. Above the slates Mr. Aplin noted also 
grits with shells and casts of various Brachiopoda, Gasteropoda, and 
01 these only Productus and Spirifer were mentioned, even by their generic 
Mr. Aplin regarded the fossiliferous series as Silurian, and remarked of the 
f, 
(p “in general aspect they resemble the fossils of the diorite slates at Gympie,” 
of His latter statement I should attach greater weight than to the determination 
“Quid Brachiopods, which range up to a much later date than Silurian. I 
^ “■''^en believe, without difficulty, in the absolute identity of the Lucky Yalley Beds 
Appendi: 
Au, 
tNe “ C,” i>. 138. 
‘Sust South Wales Geological Survey. Fourteenth Tri-monthly Keport, 
+’jj ' ■ t'Sgislative Cotincil Papers, N.S.W., 19th September, 1854. 
"^uthority'i*^jg^^““ Geology of Part of the Districts of Wide Bay and Burnett, 
dated Durandin, 1st 
Brisbane ; by 
^ Report on the Auriferous Country of the Upper Condamine, &c. Brisbane : by Authority ; 1867. 
