276 FOSSILIFEROUS TUFF, ETC., AT CAVAN, 



change, and, unless good showers are experienced, the grass gets 

 burnt up and disappears much more readily than elsewhere. 



It was whilst on a holiday trip to the Murrumbidgee River, 

 near the Boambolo ford, that I noticed a splendid anticlinal 

 fold consisting of arches of limestone, shale and sandstone on the 

 left bank of the river, about half a mile below the ford. Believ- 

 ing myself to be in the vicinity of Devonian limestones, I went 

 to the formation in order to see if I could add to my collection 

 of Devonian fossils. I found the anticline, which I have called 

 the "Glenbower Anticline," as it is situated on the property 

 known as Glenbower, portion 33, Parish of Cavan, to be about 

 one hundred and fifty feet high; the summit being of porphyritic 

 tufiF, overlying a band of quartzite, which in turn covers the 

 following layers in descending order : — Tufaceous limestone, thin 

 layers of sandstone, shale and limestone, thick hard compact 

 limestone, thin bands of sandstone, shale and limestone, hard 

 compact limestone, sandstone showing current bedding, hard 

 compact limestone, and finally, at the river-level, sandstone. 

 The dip of these strata is about 30° south. On overhauling the 

 fossils, which I obtained in large numbers m situ, to my surprise 

 I found a Try plasma of an undescribed species which is also 

 common in the Upper Silurian rocks at Hatton's Corner, and 

 Derrengullen Creek, near Yass. 



Further search was rewarded with specimens of Favosites 

 gothlandica^ Heliolites, Stromatopora, Cyathophyllum (fasciculate), 

 Syringopora (dendroid), Favosites, Amplexus, Alveolites, Atrypa 

 reticularis, Linn., together with another large species of Atrypa 

 as yet undescribed, which is common to the Yass Silurian. A 

 few minute forms of Orthis and Chonetes were unearthed in the 

 shales, which also bore Crinoid stems in abundance. Trilobites 

 were represented by a species of Cromus or Encrinurus, and a 

 very small form which, on account of the friable nature of the 

 shale preventing my obtaining more than the merest fragments, 

 I was unable to have determined. 



On forwarding some of the material to Mr. R. Etheridge, junr., 

 of the Australian Museum, for identification, he reported on them 



