The Fossil Plants 
179 
a few survive to this day with a persistence that is 
not easy to understand. We find no more Glossopteris 
or Vertebraria. But we find, in their place, a large 
Fig 45. — Sketch Section at Capertee. 
c. Ha wkesbury Sandstone; b. Permo-carboniferous resting unconformably on 
Silurian Slate, a. 
and robust fern (if fern it be), Thinnfeldia odontop - 
teroides , which is common to botli Hawkesbury and 
Wianamatta, and Ottelia prceterita, a large water- 
plant, with fenestrated leaves. 
Vtif;tflU Seal* y° , .j 8 * 
loo 46. — Sketch Section at Bundanoon. 
Professor David drew attention to the fact that 
an unconfomiity may be observed between the 
Narrabeen beds and the Permo-Carboniferous coal- 
measures in the Hunter River district in the neigh- 
bourhood of the Pokolbin Hills. As already stated, 
