TABLE II 
DATA ON INDIVIDUAL FOSSIL POLLEN GRAINS OF TRIPSACEAE 
FROM MEXICO CITY CORES 
Core Description 
Sample _ Slide Depth Size » Pore-Axis 
Core Number Number Meters Condition Axis Pore Ratio Identification 
Belles Artes 148 1 74,2-74.5 elongated 66.0 13.5 4.8 Tripsacum 
" 7 . 2 — s good 55.8 12.0 4.6 Tripsacum 
ag “ . 7 = n.p.v.* 45.0 = —_ Tripsacum 
a. “ 163 1 70.3-70.5 entire 90.0 16.5 5.4 Maize 
.* “ = la = good 75.0 13.5 5.8 Maize 
" _ a 2 _ good 93.0 15.0 6.2 Maize 
i - - 3 = n.p.v. 132.0 —<— — Maize 
- ie 4 oe fragment 19.8 13.5 5.8 Maize 
“ “ 5 — entire 127.0 17.2 7.3 Maize 
- = - 6 “oo fair 124.0 21.0 5.9 Maize 
i " 7 ~~" fair 124.0 18.0 6.9 Maize 
- ™ a 8 ~~ good 87.0 15.0 5.8 Maize 
7 “ “ 9 ~~ n.p.v. 129.0 ace aa Maize 
= a as 10 end poor 135.0 18.0 7.5 Maize 
= a 165 2 69.7-69.9 good 63.0 16.5 3.8 Tripsacum 
i ™ “ 3 -_— pore eroded 63.0 rn Tripsacum 
= " - lla cas eroded 64.5 an = Tripsacum 
7 = “ l1b ia elongated 69.0 13.5 5.1 Tripsacum 
i = _ 16 ao” elongated 60.0 15.0 4.0 Tripsacum 
ne i. a 19 “oo elongated 67.5 15.0 4.5 Tripsacum 
- om 23 ——< elongated 64.5 15.0 4,3 Tripsacum 
= = me 26 See poor Le 15.0 3.7 Tripsacum 
si = a 39 ee eroded 60.0 12.0 5.0 Tripsacum 
7 a sis 41 ~~ fair 75.5 13.5 5.5 Maize 
om = 7 41a ~~ eroded 54.0 — = Tripsacum 
“ “ ‘s 43 SS fair 79.5 13.5 5.8 Maize 
ss e 166 2 69.3-69.5 good 92.5 16.5 5.6 Maize 
7 i = 3b =~ good 78.5 12.0 6.1 Maize 
- i ' 12 = crushed 70.5 10.5 6.7 Maize 
_ m= ™ 18a id good 75.0 15.0 5.0 Maize 
_ ms = 18b tte fair 55,4 12.0 4.6 Tripsacum 
a _ ™ 21 a fair 84.0 12.0 7.0 Maize 
- - = 26 =_ = pore poor, 54.0 — — Tripsacum 
fragment 
‘i “ . 31 —~- good 105.0 16.5 6.3 Maize 
o _ a 47 “oe good 109.5 15.0 7.8 Maize 
. 7 - 63 ~ pore not clear 66.0 15.0 4.4 Tripsacum 
. .* 189 1 45.1-45.3 pore notclear, 72.0 ae — Tripsacum 
grain elongated 
- si 232 1 7.4-7.6 very poor, 135.0 —= = Maize 
fragment 
¥ = 234 3 5.9-6.1 good 103.5 15.0 6.0 Maize 
7” = 235 5 5.1-5.2 good 52.5 12.0 4.3 Tripsacum 
i “ 8 ee good 11235 19.5 aa Maize 
. ” ge 9 nn fair 82.5 15.0 5.5 Maize 
7 “ " 10 _- fair 97.5 16.5 5.9 Maize 
7 " 236 4 4.4-4.6 fair 76.5 12.0 6.3 Maize 
sie - = 5 nce pore notclear 79.5 aaa — Maize 
3 ied as 7 2 pore notclear 90.0 act = Maize ? 
“ i “ 8 ~~ good 45.0 9.0 on Tripsacum 
= - “ 10 aia n.p.v. 82.5 —— — Maize 
_ se 237 11 3.6-3.8 pore not clear 55.5 wen mai Tripsacum 
ee _ 12 — pore notclear 70.5 15.0 4.7 Teosinte ? 
a - - 13 == pore notclear 69.0 12.0 5.7 Maize 
= a a 14 ~ porenotclear 64.5 15.0 4.3 Teosinte ? 
Madero 135 1 6.0 elongated 130.0 15.0 8.8 Maize 
good 
i 130 1 5.1 n.p.v. 126.0 aoe = Maize 
128 l 4.9 good 132.0 21.0 6.2 Maize 
= a Q ar Dp: 96.0 — — Maize 
si i 4 id n.p.v. 87.0 — — Maize ? 
ae 7 6 _ n.p.v. 99.0 oa = Maize 
“e " Hi - elongated 144.0 = — Maize 
- 126 1 4.5 n.p.v. 103.5 a — Maize 
- ' 3 “ good 120.0 19.5 6.1 Maize 
- vie 4 ™ n.p.v. 99.0 —o — Maize 
sia ae 6 . good 105.0 18.0 5.8 Maize 
Ss 124 1 4.1 pore not clear 140.0 — — Maize 
* ie 2 om pore not clear 105.0 oe a Maize 
= % 3 i n.p.v. 105.0 — — Maize 
” o 4 _ pore notclear 99.0 — =~ Maize 
" - 5 bi fair 135.0 16.5 8.1 Maize 
ay 120 1 3.3 n.p.v. 127.5 as i Maize 
7 “i 2 “ good 99.0 16.5 6.0 Maize 
is . 3 - n.p.v. 112.5 — — Maize 
- 4 us pore not clear 66.0 12.0 5.5 Teosinte ? 
~ = 5 = good 124.0 18.0 6.9 Maize 
7 " 6 - n.p.v. 124.5 = = Maize 
sie 7 7 > n.p.Vv. 105.0 — _ Maize 
, = 8 = good 124.0 18.0 6.9 Maize 
™ 119 1 3.1 fair 90.0 15.0 6.0 Maize 
- 7 2 “ n.p.v. 100.3 one — Maize 
*n.p.v. indicates no pore visible for measurement. 
