78 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
thic, should be sufficiently distinct from true clays to receive a specific 
name in the system of classification; but none occurs for modern 
deposits of this type in accepted usage. Such lithified glacial rock- 
flours may be called pelodite from mndwdns, es (andos, €fdos), rte, clay- 
like rock, in reference to the fact that these rocks often clay-like or 
shaly in texture and structure, when first formed may differ widely 
from typical clay in the very small amount of kaolin which they 
contain. Pelodite is to be differentiated from pelite also by its in- 
cluded glacial pebbles. 
Closely associated with modern glacial deposits though distinct in 
origin and often very differently distributed is the fine mainly eolian 
deposit known as loess frequently derived from glacial moraines 
through their deflation by winds. Some of the finer sediments of the 
Brazilian Permian resembling clays seem to be of this origin. Such 
lithified deposits of loess may in analogy with tillite be called loessite. 
With these preliminary statements it is to be presumed that the 
following tabulated classification of glacial deposits will need no 
further explanation. 
Modern unconsolidated Divisions depending Ancient lithified 
deposits. on form. deposits. 
ig lt aa Dh aOR OD ie MATOS SEMI AT ES 
Houldersiay ROG iets, o> 2. fisiou cal odacek CC rsd MRMRIE son ce ee 
Moraine, frontal, ground-. 
drumlins 
Glacia] gravels........ 97 .Glacial conglomerates. 
ioc eee 
glacial deltas. 
Glacial sands Deltas and plains Sandstones. 
Glacial’ clays eo 0) ues cc sce ne areal eae coe 
TESS ye cit. peek casanS, «sles: pra Git ae ena ae 
Classification of the Glacial Deposits of South Brazil— With the 
above simple classification in mind, it appears that the Permian 
moraines of south Brazil presents several facies of a glacial series, 
both stratified and unstratified. 
In the tillite group must be placed the typical blue boulder-clays 
of the Rio Jaguaricatu section, the gravelly beds with large angular 
blocks, beds presumably of the ground-moraine or subglacial type. 
Unfortunately the limited exposures in the deeply forested river 
valley do not permit of a determination of the topography of these 
ancient beds of drift. In somewhat sharp contrast with the analogue 
