26 
E. DE C. Clarke and C. Teichert. 
Thickyiess . — Owing to tlu^ fact that the base of the Timiblagoocla Sand- 
stone is not exposed and also ])ecause of tlie lateral variations in thickness 
of most of the higher stages of the series^ it is somewhat difficult to give 
a reliable estimate of the total thickness of the IMiirchison House Series. 
Near the nortliern end of Second CJnlly 355 feet of sediments are exj^osed 
above the toji of the Tuuiblagooda sandstone. However, some members of 
the series, particularly the Toolonga Chalk ami the Alinga Beds, are thinner 
here than (‘ls(*where, so that the total thickness of the beds in other sections 
might well be somewhat greater. To this must he added the minimum thick- 
ness of the Tumblagooda sandstone (4IH) feet). It may then be concluded 
that the minimum thickm^ss of the IMurchison House Series in the area sur- 
veyeil by us is at least 75(1 feet. 
2. TrjiULAGooDA Sandstone. 
Derivation of //uau'.— Tumblagooda Hill, on the coast two miles north 
of the month oi' the Mniadiison Jliver, about 290 feet high, where a 
typical section is exposed. 
Areal distribntion and ontvyopf ^. — The Tuinldagooda Sandstone crops 
out on lioth sides of tlie Arnrehison River (text fig. 4). On the south-east 
Text Fig. 4. 
River flat near Tutula windmill showing hillocks of Tumbla- 
gooda Sandstone. 
