38 
PROCEEDINGS OF THE ROYAL SOCIETY OF QUEENSLAND. 
The site of Locality B is in a railway cutting on a branch railway 
line leading from Ipswich to the Mt. Crosby Pumping Station. Here a 
basal conglomerate containing quartzite boulders and pebbles uncon- 
formably overlies the Fernvale Series of the Brisbane Schists, dips at a 
low angle to the S.W. and is overlain by shales. It is thus within a short 
distance of the base of the Ipswich Series of Upper Triassic age. The 
fossil horizon is a band in these shales situated approximately 20 feet 
above the top of the conglomerate and occurring at intervals over a 
distance of more than two miles. Collectors who visit Locality B may 
locate the horizon by counting 144 railway sleepers from the near 
side of the road bridge which spans the railway cutting. The insect- 
bearing horizon will then be found as a band in the S.W. wall of the 
cutting approximately 3 feet above the level of the rails. The fossils are 
not confined to one layer but have been proved to occur at various levels 
in a band at least a foot in thickness. No systematic study has been 
Text Fig. 1. 
made of the minute stratification of the occurrence. Specimens are 
relatively abundant in the fossiliferous horizon, the average rate of 
discovery being about two good specimens per hour of splitting of the 
soft shale. Several thousand specimens have been secured by different 
collectors from the several occurrences on this horizon. Impressions 
of wings of Coleoptera and Orthoptera seem to predominate but wings 
of many Homoptera as well as some Mecoptera, Trichoptera, and kindred 
insects occur. 
