Table 17. Components of strain ellipsoid determinations of Guyet Formation conglomerate.

SAMPLE RELATIVE STANDARD AXES EIGENVALUES ERROR IN COMMENTS ON THE DESTRAINING }
NUMBER AXES DEVIATION ATTITUDES CO-ORDINATE
SIZES OF AXES 1 2 INTERCEPTS SECTION CLASTS USED DISTRIBUTION AXIAL RATIO
$ 1 1 264/39 52 21 Vie PH | all deltoid 2.18
2.05 WW 050/46 21 16 Y- .574 | all deltoid 2.95
3.39 36 158/18 50 16 X- .345 HI all random 1.65
Ded | 064/01 ao Z- .184 | all random 1.0
1.08 10 331/86 106 1 Nee ll all random 2.46
2.81 .28 154/07 108 106 X- .492 Ill rock fragments random “at
2 1 060/39 38 2 Z- .230 | all random 1.08
1.13 07 251/51 62 2 Y- .265 II all random 2.46
2.89 33 150/15 416 oe PAP Oe Ill rock fragments random afc
2 | 245/12 42 | Z- .149 | all random 1.0
1.06 07 040/77 308 1 Z-1.720 Il all random 2.46
213 4 155/06 ott Ai 2h 363 Ill quartz & chert random 2.61
2 1 065/48 (if 2 ha Pay | all random Ae
Ale 13 242/41 39 2 Ne 302 II all random 2.46
gAz 43 155/01 39 30 X- .736 Ill rock fragments deltoid 3.07
oo | 206/20 Wer 12 Z- .109 | all random We20e
1.22 04 026/70 16 11 Y- .083 II all random 1.38
1.49 06 296/00 60 13 X- .138 HI all random eer
$ 4 1 232/38 332 24 Z- .101 | all random 1265
1.60 05 079/50 34 24 Y- .194 II all random 2.01
2.39 09 333/14 142 34 X- .071 Ill all random 1.82
4 1 132/80 353,706 28 aah) | all deltoid 1Z0
He 03 135/02 10® 347,529 Y- .487 Il all random 2.46
2.56 04 326/10 106 28 X- .245 HI all deltoid 2 ie
sie) 1 238/11 134 12 Z- .071 | all random Weld
mane) 03 355/66 22 11 Y- .082 II all random 1.29
hioe 04 143/22 54 19 X- .060 III all random lee
$ 6 1 212/42 47 21 Z- .270 | all random 1.50
1235 12 010/50 27 5 Y- .326 II all random 1.50
1.69 iis 111/07 40 5 X- .153 HI all random 27
6 1 219/38 3897 100 Ke KO | chert random 1265
1.60 06 342/40 113 58 Voulo2 Il chert random Pee
2 oy 08 103/27 1376 60 X- .045 Ill chert random 1.49
6 1 208/36 58 Pe nel? | quartz random 1.41
te27, 09 016/57 14 De > eae Il quartz random 1.00
1.54 11 114/03 32 5 X- .138 Ill quartz random le22

est axis normalized to 1. Each mean relative axis size has a stand-
ard deviation. The standard deviation for the shortest axis is
zero because all the short axes lengths were normalized to 1.
The smaller the standard deviation, the closer the ellipses are
to intersecting each other on the co-ordinate system and to repre-
senting an ellipsoid.

Each mean attitude of the strain ellipsoid is given with its
associated eigenvalues. The difference in magnitude of these
eigenvalues indicates how scattered the six axes trial attitudes
are. The greater the ratio between the first and second eigen-
value, the better the ellipsoid represents the 3 ellipses derived
from the sections. The third eigenvalue is equal to 1 due to
normalization.

The errors in the co-ordinate intercepts for each of the 3
determination (A X, A Y and A Z) are given as a GOFI of the

combination of ellipses to an ellipsoid. The smaller the values,
the greater the probability that the ellipses from the three
sections represent the determined ellipsoid.

A strain ellipsoid determination standard is listed in
Table 17 to which the GOFI can be compared. The standard
was made from an ellipsoid of known orientation and size from
which its ellipse intersections with three prependicular planes
were measured graphically. The only errors introduced in the
determinations of these ellipses are those from the graphic deter-
minations. The variation in orientation of the ellipsoid axes are
plotted in Figure 60 to show the relationship between the scatter
of orientation and the eigenvalue GOFI. The calculated direc-
tion of the intermediate axis and magnitudes of the axes show
the greatest deviation from the original ellipsoid.

Several of the strain determinations show GOFIs compara-

93