MICROPHOTOGRAPHS. 



All the microphotographs have been taken with crossed nicols, and 

 are magnified 22 diameters. , 



PLATE VIII. 



1. Sandstone from Wright's Quarry, Helidon, showing the angular 



nature of many of the quartz grain*? and the abundant cement. 



2. Sandstone from Montgomery's Quarry, Murphy's Creek, showing 



the uneven size of the grains and abundant cement. 



3. Sandstone from Yan Gan, showing the fine, even-grained character 



in comparison with the other sandstones except the Calvert 

 stone. 



4. Sandstone from Calvert, showing its fine, even-grained character 



and similarity to* Yan Gan sandstone. 



5. Sandstone from Jeay's Quarry, Goodna, showing the uneven size 



of the grains and the relative abundance of cement. 



6. Sandstone from Stanwell, 20 miles from Rockhampton. The uneven 



grain-size and amount of cement are well shown. 



