Sedimentary Rocks. 77" 



The probability of a higher zone is indicated. This division is- 

 set out only as a basis for further work. 



6. The distribution of a series of grits, sandstones and shales,., 

 termed the Riddell Grits, is shown, and some account is given 

 of their field relations and fossils. It is held that — 



(a) They pverlie Dicranograptus shales (Upper Ordo- 

 vician). 



(b) They underlie the Kerrie Conglomerate. 



(c) Their contained brachiopod and coral fossils indicate 

 a mid or newer Silurian horizon, though some older 

 forms are present. The presence in them of Diplo- 

 graptus and Climacograptus indicates a greater age, 

 and if the shales containing Dicellograptus belong to- 

 the series, that age must be Upper Ordovician. The 

 suggested age is Upper Ordovician, near the close of 

 the period. 



7. The Kerrie Conglomerate is stated to overlie, unconform- 

 ably Dicellograptus shales at Emu Creek, and Diplograptus shales 

 and Riddell Grits north-west of Riddell. Fossils were found 

 in the pebbles of the Conglomerate, similar to those obtained 

 from the Riddell Grits, and the view is taken that it is in part 

 formed from the Grit. The suggested age is basal Lower Silurian. 



8. The Tertiary gravels are briefly mentioned, their meta- 

 morphism by the Newer Basalt described, and the existence of 

 an east and west fault in the south of the district deduced from 

 art abrupt change in the levels of the gravels, corroborated by a 

 similar steepening of grade in the creeks along a line approxi- 

 mating to 37° 35 ' S. 



9. Acknowledgement is made of help received, and a biblio- 

 graphy of papers, etc., referred to, is appended. 



XIII.— Acknowledgments. 



Our thanks are due in the greatest measure to Mr. Chapman,. 

 Palaeontologist of the National Museum, Melbourne. Not only 

 has he devoted much time to the examination, and, where prac- 

 ticable, the identification of fossils, particularly from the RiddelE 

 Grits, but he has throughout assisted us with advice and kindly 

 criticism. Mr. R. A. Keble,.of the Mines Department, rendered 

 us valuable assistance, especially in the physiographical section 

 of the paper. Professor E. W. Skeats, D.Sc, of the Melbourne 

 University, kindly read through the paper, and we have had the: 



