No; 4. The Origin and Structure of the Roxbury Conglomerate. 
By GEORGE ROGERS MANSFIELD. 
CONTENTS, 
PAGE. PAGE. 
INTRODUCTION. Delta Deposits «ax ALS 
E Lacustrine Deposits. ae 120 
Definition . a A 2 Estuarine Deposits co LE 
Areal Boundaries : <. 95 Glacial Depositar aso. 108 
Maps . oo bs 95 India, 2.0 es OG 
The Northern Bounda eat) aan, 
= ústralla ao o 0. 28197. 
phe ee Extension . 96 South Africa. . ...:..199 
The Southern Boundary . . 97 Correlation; India, Austra- 
gh nae “eb stot lia, South Africa . . 130 
Neighboring AS 2198 Brean o, 131 
Other Areas . . ba 9S Nofa a 131 
Lithological Relations Mie 9S Als wu, 133 
Age Relations . . + 100 Yard an : 134 
Unity or Diversity of Onin ig, 102 United States; Newark 
Broad and Narrow Terrane Fondation u ur. = tea 
: Views Sa ee oa | ie South America < <.. 135 
Views of a De... Crush-Conglomerates . . . 136 
Scope of Field Work . . . . 104 Combinations of Processes . 136 
Scope of Laboratory Work . . 104 Analytical Discussion. . . 138 
THE ORIGIN OF CONGLOMERATES. Matrix ee he 
Marine 22200... SO 
General Statement ©... ..... 105 Klüviatile 2.0, ya ee 4139 
Definitions and Deseriptions . 105 Lacustrine ee 189 r 
Conglomerates 2... 24,4105 Hstudrme - £9! 190 
Breceias ern. 4212) ste vt 2106 Glacial wer ag 
Agglomerates . . «in 2106 Cros a ado 
Volcanic Conglomerates er 06 Pebbles mr TIE na. 140 
Types of Conglomerate . . . 107 Marne 2 do 
Marine Conglomerates . . 107 Hluviatile a 
Cretaceous of Texas . . 107 Lacustrine re JA 
Pottsville Conglomerate . 109 Ustuarino ; 2... TUF 14 
Fluviatile Conglomerates. . 111 Glacial” o o o „u, 140 
India sau. 0000000 TT CTS oe me. 142 
Persia... e LES Colors e ec) Oe Sad 
Europe; Gri Buta le Marne O 
The United States . . . 115 Fluviul +... 0820748 
