1922] HARVEY—PINE FORMATION 41 
Age distribution of facies 
The ecological spectrum (table VI) and valences (table VII) 
convey a very definite concept of the Big Pines formation. Never- 
theless the picture is incomplete. It is to supply this deficiency 
in the visualization of the formation that the following method of 
analysis has been devised. It is essential that the age of the facies 
and the relative abundance of the individuals of each age be known, 
for therein is recorded not only the present status, but much of the 
TABLE VIII 
AGE DISTRIBUTION OF FACIES, UPPER PINES, STATIONS 6 AND 7 
2 » ° w wn ° w ° ed ° ww ° 
Sgt wear LT ae Bg Do i Beal bee pda 
” a] a a ~ * + + ww ve] =) 6 
Pinus resinosa....... 4.01.9) 47.8) 6112 1.67. 6 ere herp 
Pinus Strobus....... ace 8 lS ee 81 ot 6h ei oe re 
Quercus alba........ Coe oe ie ee LS ee ST 
Quercus rubra....... nee ie npn eo 7 ee 8 Vins 
Acer rubrum........ I iss ‘eves Fe 
el ° w °o 
m - eI Ri Si si SUS baw s 
ie + ee pat ae H 1s] 3 
a i z i Plgisielelelel 2 
nus res I I 2 63 | 100 
Pinus Strobus....... ae es ee I | 59 | 92.6 
cectus alta... 5 tL. tr 9.2 
Quercus rubra....... 3] 4-7 
cer rubrum. : .. 5.1. . a 
past history, as well as the future ecological tendencies of the 
formation. 
The data were obtained by running transects through several 
portions of the formation, measuring the circumference (BH) of 
the trees as met. Numerous cores were taken with an increment 
borer in order to establish an increment factor which could be used 
to convert the circumferences into age equivalents. This, however, 
gave no ratio entirely satisfactory for all sizes, probably due to too 
fewsamplings. It is believed, however, that the circumference data 
reveal the relative age distribution, although actual age determina- 
tions are greatly to be preferred. Several transects gave essen- 
tially identical results. The record of one of these transects, run 
