24.12.2013 Views

r - Memorial University's Digital Archives Initiative - Memorial ...

r - Memorial University's Digital Archives Initiative - Memorial ...

r - Memorial University's Digital Archives Initiative - Memorial ...

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Il7<br />

parts of conglomerate horizons resemble facies class 82.1.<br />

A more useful discussion ofconglomerate classification is given by Surlyk (1984).<br />

According 10 lhe descriplions given by Surlyk (1984), conglomerates of lhe Lower Head<br />

Formation seem 10 correspond mainly 10 his (acie.~ 9 (graded, matrix-supported<br />

conglomerate with random fabric), 10 (graded, matrilt-supponcd. imbricated<br />

conglomerate), and 14 (conglomerate grading inlo sandstone). Facies 6 (inverse [0<br />

normaJly graded, matrix-supported conglomerate) is also present in some places. Al 51.<br />

Paul's In[el, lhe conglomerate beds might best be described in terms of Surlyk's ((984)<br />

facies 13 (compositcconglomerates) in which sandstone layers are complexly interbedded<br />

with conglomerate layers.<br />

Facies 9 and 10 are interpreted by Sur!yk (1984) to have been deposited as a<br />

result of direct suspension from high.density IUrbidity currents, facies 6 was deposited<br />

by frictional freeZing of a basal traction Carpel followed by suspension sedimentation<br />

from high-densiry turbidiry currents, and facies 14 represents a fining upward sequence<br />

deposited by surging flows, It should be noted Ihal according to Surlyk (1984), most of<br />

the descriptive features of a conglomerate, such as inverse grading and imbrication,<br />

provide information on Ihe hydrodynamic conditions of deposition and may provide little<br />

informalion on rhe proJ(imity of the flow to the head of a fan or to the source.<br />

The composite conglomerate, facies 13 (firsr described by Hendry, 1973) was<br />

likely deposited by sllccessive pulses of coarse grained gravity flows resulting from<br />

progressive headward failure on a slope. Comparison ofthe Lower Head conglomerates,<br />

panicularly those at 51. Paul's Inlet. wilh those described by Hendry (1973) shows many

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!