Table 2. Phenocryst minerals, wholerock SiO_{2} content, and notes for samples from pre1991 eruptive periods.
[Abbreviations: pl, plagioclase; qz, quartz; hb, hornblende; cm, cummingtonite; bt, biotite; ol, olivine; ag, augite; hy, hypersthene. X, essential (>5%); x, varietal (<5%); t, trace; R, thick rims (>30 um); r, thin rims; c, cores of hornblende crystals; S, resorbed essential; s, resorbed varietal; B or b, broken crystal fragments; h, with hornblende rims. SiO_{2} in wt% (volatile free). Samples are of the dominant juvenile material in dated deposits except for those samples that have a dash in the "Associated ^{14}C sample" column. Ages for dated deposits given in ^{14}C years; other ages are estimates based on stratigraphic relations or weathering]
Period 
Age 
Field 
Location 
Associated ^{14}C sample (figs. 6, 7, table 1) 
Notes 
N. latitude 
E. longitude 
Phenocryst minerals 
%SiO_{2} 


pl 
qz 
hb 
cm 
bt 
ol 
ag 
hy 

Buag 
~400 
N600B 
Marella River 
 
Essential clast in lithic pyroclastic flow from summit dome 
1508'00'' 
12022'00'' 
X 
x 
X 

x 



62.0 
Buag 
570+70 
P17D 
Clark A.B., 
8 
Phenocrystrich dacite pumice from terrace deposit 
1508'42'' 
12033'24'' 
X 
x 
X 
r 
x 



65.7 
Buag 
950+70 
P225922A 
Pasig River 
15 
Dacite pumice in dated "gray lahar" 
1507'56'' 
12028'59'' 
X 
S 
X 
r 
X 



65.5 
Buag 
950+70 
P225922B 
Pasig River 
15 
Dacite pumice in dated "gray lahar" 
1507'56'' 
12028'59'' 
X 
S 
X 
r 
x 



65.2 
Buag 
950+70 
P225921 
Pasig River 
15 
Banded pumice from dated "gray lahar" 
1507'56'' 
12028'59'' 
X 
x 
X 
r 
x 
x 
x 


Buag 
950+70 
P225923 
Pasig River 
15 
Banded pumice from dated "gray lahar" 
1507'56'' 
12028'59'' 
X 
S 
X 
r 
x 
x 
x 

63.6 
Buag? 

P225923 
Pasig River 
 
Mafic inclusion in pumice. Not in place, possibly from "gray lahar." 
1507'56'' 
12028'59'' 
S 
s 
s 


s 
s 

52.0 
Buag? 

P5C 
Marella River 
 
Pumice from deposit beneath summit dome pyroclastic flow? 
1505'00'' 
12020'00'' 
X 
s 
X 
r 
X 



65.8 
Buag? 

P40ii 
Marella River 
 
Mafic inclusion in dacite block. Deposit forms fluvial 
1508'00'' 
12030'00'' 
no thin section 
53.8 

Buag? 

P40i 
Marella River 
 
Dense dacite, host for inclusion 
1515'00'' 
12022'00'' 
X 
S 
X 

x 
h 
t 

63.6 
Maraunot 
2,660+70 
P37923 
Clark A.B., near TV tower. 
18 
Pumice lapilli in dated terrace deposit 
1511'18'' 
12030'20'' 
X 
s 
X 
R 
c 



65.8 
Maraunot 
2,870+100 
P35921A 
O'Donnell River 
22 
Phenocrystrich dacite pumice from upper of 3 pyroclasticflow deposits. 
1516'00'' 
12022'00'' 
X 
s 
X 
R 
x 



62.5 
Maraunot 
2,870+100 
P35921B 
O'Donnell River 
22 
Phenocrystpoor dacite pumice from upper of 3 pyroclasticflow deposits. 
1516'00'' 
12022'00'' 
B 
b 
b 
r 




62.5 
Maraunot 
2,870+100 
P35921C 
O'Donnell River 
22 
Darker, finegrained pumice from upper of 3 pyroclasticflow deposits. 
1516'00'' 
12022'00'' 
X 
s 
X 
R 
x 



63.4 
Maraunot 
2,990+80 
P2Bi 
Sacobia River 
29 
Phenocrystrich dacite pumice from dated pyroclasticflow deposit. 
1511'00'' 
12030'00'' 
X 
s 
X 
Rx 
X 



65.6 
Maraunot 
2,990+80 
P2Bii 
Sacobia River 
29 
Phenocrystpoor dacite pumice from dated pyroclasticflow deposit. 
1511'00'' 
12030'00'' 
B 
b 
b 
t 
t 



64.2 
Maraunot 
3,260+70 
P35922A 
O'Donnell River 
31 
Phenocrystrich dacite pumice from middle of 3 pyroclasticflow deposits. 
1516'00'' 
12022'00'' 
X 
s 
X 
t 
t 



65.5 
Maraunot 
3,260+70 
P35922B 
O'Donnell River 
31 
Phenocrystpoor dacite pumice from middle of 3 pyroclasticflow deposits. 
1516'00'' 
12022'00'' 
B 
b 
B 
t 




64.9 
Maraunot 
3,260+70 
P35922C 
O'Donnell River 
31 
Darker, finegrained pumice from middle of 3 pyroclasticflow deposits. 
1516'00'' 
12022'00'' 
X 
s 
X 


t 


62.1 
Maraunot 
3,260+70 
P35922Fi 
O'Donnell River 
31 
Mafic inclusion in phenocrystrich dacite pumice from 
1516'00'' 
12022'00'' 
X 

X 


h 


57.2 
Maraunot 
3,390+90 
P11 
Sacobia River 
32 
Phenocrystrich pumice from pyroclasticflow deposit 
1511'00'' 
12029'36'' 
X 
s 
X 
R 
t 



66.1 
Maraunot 
3,590+90 
P39A 
Marella River 
33 
Phenocrystrich pumice from pyroclasticflow deposit 
1505'00'' 
12020'00'' 
X 
s 
X 

t 
h 


62.8 
Maraunot 
3,590+90 
P39B 
Marella River 
33 
Dense phenocrystrich dacite lithic from pyroclasticflow deposit. 
1505'00'' 
12020'00'' 
X 
s 
X 
R 
c 



66.3 
Maraunot 
>1,000 
P37922a 
Clark A.B., 
 
Pumice lapilli from tephra fall deposit, weathering suggests >1,000 yr B.P. 
1511'18'' 
12030'20'' 
X 
s 
X 
R 





Crow Valley 
4,800+60 
P12A 
Sacobia River 
35 
Dacite pumice from terrace deposit 
1511'00'' 
12030'00'' 
X 
S 
X 
R 
t 



64.9 
Crow Valley 
4,800+60 
P12B 
Sacobia River 
35 
Phenocrystrich dacite pumice from terrace deposit 
1511'00'' 
12030'00'' 
X 
t 
X 
r 
c 




Crow Valley 
4,890+70 
P223924 
Sacobia River 
37 
Dacite pumice from base of dated pyroclasticflow deposit 
1510'55'' 
12028'55'' 
X 
s 
X 
R 




65.6 
Crow Valley 
4,960+70 
P31B 
O'Donnell River 
39 
Dacite pumice from pyroclasticflow deposit 
1514'54'' 
12022'00'' 
no thin section 
65.6 

Crow Valley 
4,930+80 
P35923A 
O'Donnell River 
38 
Phenocrystrich dacite pumice from lower of 3 pyroclasticflow deposits. 
1516'00'' 
12022'00'' 
X 

X 
R 




65.1 
Crow Valley 
4,930+80 
P35923B 
O'Donnell River 
38 
Phenocrystpoor dacite pumice from lower of 3 pyroclasticflow deposits. 
1516'00'' 
12022'00'' 
B 
B 
b 
b 
t 



65.6 
Crow Valley 
5,010+80 
P32B 
O'Donnell River 
40 
Dacite pumice from thick pyroclastic flow on north side of drainage. 
1514'48'' 
12021'48'' 
X 

X 
R 




65.9 
Crow Valley 
5,100+70 
P31A 
O'Donnell River 
42 
Dacite pumice from pyroclasticflow deposit 
1514'54'' 
12022'00'' 
X 
s 
X 
r 
t 



65.6 
Crow Valley 
5,130+80 
P41B 
Bucao River 
43 
Dacite pumice from lahar, ^{14}C age on interbedded silt 
1515'42'' 
12010'06'' 
X 
s 
X 

t,c 



63.4 
Pasbul 
8,380+80 
P42 
Gumain River 
48 
Dacite pumice 
1502'03'' 
12027'02'' 
X 

X 
t 
c 



63.9 
Inararo 
>35,000 
P313921 
Abacan River 
51 
Phenocrystrich pumice from eroded pyroclasticflow deposit. 
1510'25'' 
12029'50'' 
X 
S 
X 

X 



66.7 
Inararo 
>35,000 
P116i 
Abacan River 
51 
Dacite pumice lapilli from matrix of columnarjointed pyroclasticflow deposit. 
1511'00'' 
12030'00'' 
X 
Xs 
X 
R 
X 



64.4 
Inararo 
>35,000 
P116ii 
Abacan River 
51 
Dacite pumice block from columnarjointed pyroclasticflow deposit. 
1511'00'' 
12030'00'' 
X 
Sx 
X 
R 
X 



65.8 
Inararo 
>35,000 
P24D 
Abacan River 
 
Dacite pumice block from basal lahar or pyroclasticflow deposit in Abacan River. 
1511'00'' 
12030'00'' 
X 
Xs 
X 

X 



67.1 
Inararo 
>35,000 
P44 
Abacan River 
 
Indurated tuff at base of sequence in Abacan River 
1511'00'' 
12030'00'' 
X 
s 
X 

x 
t 


64.4 
Ancestral 

P34 
Pasig River 
 
Dominant lithic type from indurated lahar 
1508'00'' 
12030'00'' 
X 

X 




x 
66.0 