The Waxahachie daily light. [volume] (Waxahachie, Tex.) 1894-current, 1911-12-16
NEW MAP OF NORTH AMERICA

Associated Press Special.

Associated Press Special
Washington. Dee 16.--The most
notable map publication Of the
year is the large geologic map of
North America Just issued by the
United States Geological Survey. 1t
represents an exceptional type of
engraving and photographic color
work and is printed In four sheets
which fitted together and mount
ed make map feet inches high
by feet wide, the largest piece OF
work ever issued by the survey.
The scale Is ] TO 100000, or 80
miles to the inch, and the plan Of
projection Is In harmony with the
universal world map on
a scale Of to 100000, in that
It shows the units of publication OF
the world map, each OF which enl-
braces four degrees or latitude and
. six degrees of longitude.
Each Sheet, Printed Fourteen Times
The color scheme of the map Il
a striking one. In all there are
color distinctions. varying from Il
brilliant red to pale tints approach
ing white. These were produced by
a separate printings from ltho-
graphic stones, requiring In many
places two or three combinations OF
color TO produce the desired effects.
IF the weight Of paper and heavy
stones lifted back and forth in the
printing of this job were to be COM
puted it would run into the hun
dreds of tons. The accuracy of the
register" or fitting together Of
the color blocks In small areas
throughout the map, 10 remarkable.
The work was done In the survey 8
own engraving and printing plant,
and 1t Is believed that there are few
II any other establishments In the
United States capable of turning out
such production. The AZ color
distinctions rep eacnt as many di'
visions of rock strata Thus tbs
rocks of seven divisions OF the Pale
{ ozoic area are each represented by &
. color. besides three separate eoi'hi
{ for undlfferentiated rocks. anf
! thcro are other colors for the dlyis
Ions Of tho Mc8ozoir, the Tertiary
and the Quaternary
The cooring OF tho map Is botl
= effective and pleasing The sahemi
Is systematic in that the color
range in prlsmatic order from yel
low in the upper portion Of the geo
logic column through greens
blues and puppies to pluks am
browns at the base. The colors 70
the lgneous rocks, both plutoni
ana volcanic, are mostly bright red
| Viewed as wall map, the ma
OF North America shows only tn
larger geologic units as the smalle
divisions are represented by differ
ont shades and tlnts Of the Sam
or closely allied colors which ar
indistinguishable at moderat
distance.
Valuable for Detailed study.
Viewed close al hand these mino
distinctions can be read and the
map can be used for detailed stud
limited only by the scale. When II !
used as wall map the regions II
Illustrating different types of geolo
Ky stand out boldly The great Can
adam shield of pre-Cambrian rock
Is represented by a subdued colo
in a pattern Stimulating crystalinn
texture. Parallel bands of darke
colors from New Brunswick to Ala
bama mark the trend Of the Appal
aehians. while the broad area O
blue and gray colors to the wef
| represent the coal fields OF the In
terror. and fringe OF yellow color
to the east and south represents th
coastal plain sediments. A brilliar
- vermilion coloring over much OF IN