3.4. Chivay Obsidian Consumption Contexts

Archaeological research conducted at four sites in the south-central Andean highlands, the consumption zone for Chivay obsidian, provide evidence for the changing use of Chivay obsidian over long time periods. This section will begin by focusing on the four sites because they important here as the sites have provided stratified evidence of obsidian consumption during the Archaic and Formative in well-dated archaeological contexts. This review of the sites will be relevant in subsequent discussions of change in obsidian use over time in the region, and for interpreting activities at the Chivay source.

3.4.1. Asana

The site of Asana is at 3435 masl in the Osmore drainage of Moquegua, and it lies 185 km or 50 hours by the hiking model to the south-east of the Chivay source. Excavations at Asana were directed by Aldenderfer(1998: 76-80)between 1986 and 1991 and in the lower levels of the deeply-stratified site obsidian was found in low concentrations.

Titicaca Chronology (BCE)

14C yr bp

Lab Code (Beta-)

Cal.BCE

14CSample Provenience

Obsidian Provenience

Obsidian Type

Obsidian

Artifacts

Early Form.

2000-1300

3640±80

23364

2300-1750

II (sup), TU1

II

Aconcahua (visual ID)

n=3, 0.4%

Late Archaic

5000-3300

6040±90

24634

5210-4720

XIVb, I25b

XIV

n=1, 2%

Middle Archaic

7000-5000

6550±110

24629

5680-5300

XVIIa, G24b

KF4a: J29D-8; XVIIA

Chivay

6550±110

24629

5680-5300

XVIIa, G24b

KF4b: J29D-8; XVIIA

Chivay

Early Archaic

9000-7000

8620±110

47057

8200-7450

PXIX, P38b

8780±90

43920

8250-7600

PXX, V51a

KF5: F28D-5; PXXi

Chivay

8720±110

33303

8250-7550

PXXI, R43c

KF6: P38D-W; PXXI

Chivay

8720±110

33303

8250-7550

PXXI, R43c

KF2: W41A-4; PXXII

Chivay

8720±120

43922

8250-7550

PXXIII, X36c

8720±110

35599

8250-7550

PXXIV, T34a

n=11, 0.36%

KF3: T42B-7;F28D-5

Chivay

n=1, 0.08%

KF1: U41D-6; PXXV

Chivay

9820±150

40063

9900-8700

PXXXIII, S38c

Table 3-4. Asana obsidian samples, collections, and associated14C samples by level (Aldenderfer 1998: 131, 157, 163, 209, 268;Frye, et al. 1998).

These data from Asana show that low frequencies of Chivay obsidian occurred regularly through Early and Middle Archaic levels at the site despite the presence of high quality cherts nearby, and low quality obsidian from the Aconcahua source located about 50 km away. During the Late Archaic, obsidian disappears from the site and in a level that is transitional between the Terminal Archaic and Early Formative, obsidian returns in the form of lower-quality Aconcahua material. These data will be discussed in more detail below as obsidian use is explored by time period.

3.4.2. Qillqatani rock shelter

The rock shelter of Qillqatani is at 4400 masl along the Río Chila to the southwest of Mazo Cruz, and it is 221 km or 50.3 hours walking time, by the hiking model, across the puna from the Chivay obsidian source. Qillqatani lies on the southwestern perimeter of the Lake Titicaca Basin in the headwaters of the ríoHuenque drainage in the Department of Puno, and it is not far from the headwaters of the Osmore drainage on the western slope in the Department of Moquegua. The shelter has a strong pastoral component, but excavations revealed occupations dating back to the Middle Archaic. The shelter is also known for elaborate rock art panels. Qillqatani was excavated in 1990 by Aldenderfer in two adjacent blocks, labeled East Block and West Block (1999;2005;in prep.). The East Block measured 20 m2in horizontal extent, while the West Block measured 60 m2.


(a) Titicaca chronology,

calibrated dates

(b) Qillqatani periods,

calibrated dates

(c) Uncalibrated14C dates in r.c.y.b.p.

(d) Qillqatani provenience
of obsidian

(e) Obsidian sample

(f) Block

LH AD1476 - 1532

LH 1476 - 1532

WIII / EIII

Level D11d-507/WIII:

400±50bp(B118156)

     

LIP AD1100 - 1476

LIP 1100 - 1476

WIV - WV / EIV

 

H12C-3; WV; LIP

Chivay

West

Tiwanaku Horizon

AD400 - 1100

Tiwanaku

AD 500 - 1100

WVI - WVII / EVI

Level D9a/F7/WVIII:

2210±60bp(B93354)

E9A-5; WVII; F-3

Aconc.

West

E6A-4; WVII

Chivay

West

Late Formative

400 BCE - AD500

WVIII - WIX /
EVII - EVIII

 

D6C-8; WX; F-5; 1.45

Chivay

West

Late Formative

500 BCE - AD 400

D9A-8; WX; F-5; 1.45

Chivay

West

G13A-10; WX

Chivay

West

G13A-10; WX

Chivay

West

D6C-9; WXI; F-6; 1.6

Chivay

West

H12D-10; WXI; F-12; .75

Chivay

West

H12D-10; WXI; F-12; .75

Chivay

West

I12D-8; WXI; F-13; 2.00

Tumuku

West

Formative C

900 - 400 BCE

WXII - WXIV /
EIX - EXIV

East Block dates

Level D25d/F10/EVI:

2210±50bp(B93355)

Level F23a/F4/EXI:

2620±60bp(B93357)


West Block date

Level G7c-513/WXII:

2550±80bp(B43924)

E25B-10; EIX; F-7

Chivay

East

Middle Formative

1300 - 500 BCE

D25D-6; EIX; F-7

Chivay

East

D26B-10; EXI; F-12

Alca

East

F23B-11; EXI; F-3

Chivay

East

F24B-9; EXI; F-13

Aconc.

East

D6D-11; WXIII; F-8; .75

Chivay

West

F11A-3; WXIII; 1.65

Chivay

West

D26D-13; EXIV; F-10

Tumuku

East

D26C-13; EXIV

Chivay

East

D26C-13; EXIV

Tumuku

East

Formative B

1500 - 900 BCE

WXV - WXIX

 

D8C-12; WXVIII; F-11

Chivay

West

D8C-12; WXVIII; F-11

Chivay

West

G7D-11; WXVIII; 5.5

Chivay

West

Early Formative

2000 - 1300 BCE

Level D6/F7/WXVI:

3000±70bp(B43929)
Level D6a-522/WXIX:2940±70bp(B43925)

E9D-12; WXVIII; F-9

Chivay

West

Formative A

2000 - 1500 BCE

WXX - WXXIII

E6C-14; WXX; F-7; 1.4

Chivay

West

 

E9A-15; WXX; 2.4

Chivay

West

H13A-15; WXX; 4.6

Chivay

West

Terminal Archaic

3300 - 2000 BCE

Terminal Archaic

3300 - 2000 BCE

WXXIV

Level F9a-532/WXXIV:3660±60bp(B43926)

F28B-19; WXXIV; HF-1

Chivay

West

F28B-19; WXXIV; HF-1

Chivay

West

F28B-19; WXXIV; HF-1

Chivay

West

G9E-19; WXXIV; 98.70

Chivay

West

G9E-19; WXXIV; 98.20

Chivay

West

G10B-20; WXXIV; HF-2

Chivay

West

Late Archaic

5000 - 3300 BCE

Late Archaic

5000-3300 B.C.E

WXXV-WXXIX

Level E9d-541/WXXX:
5620±120bp(B43927)

E9D-18; WXXX

Chivay

West

Middle Archaic

7000 - 5000 BCE

Middle Archaic

7000-5000 B.C.E
WXXX - WXXXVI

Below level WXXX:7100±130bp(B18926)

7250±170bp(B18927)

FAC-25; WXXXIV

Source unknown

West

Table 3-5. Qillqatani excavation levels, radiocarbon dates, and obsidian samples. (a) Titicaca chronology, (b-c) levels and14C dates from Qillqatani, all dates are on charcoal and were analyzed by Beta Analytic, from Aldenderfer (1999). (d-f) Obsidian from Qillqatani chemically provenienced at MURR from data presented by Frye, Aldenderfer, and Glascock (1998), with "Tumuku" type replacing reference to "possible Alca-2", and Aconcahua type abbreviated to "Aconc."


/misc/image008.gif

Figure 3-7. Qillqatani data showing percentage of bifacially flaked tools and percentages of debris made from obsidian per assemblage by count (Aldenderfer 1999;Aldenderfer in prep.).


 

TOOLS

DEBRIS

 

Obsidian

Non-Obsidian

 

Obsidian

Non-Obsidian

 

Qillqatani Period

No.

Ave Wt.

No.

Ave Wt.

Total

No.

Ave Wt.

No.

Ave Wt.

Total

Late Horizon

AD1476-1532

   

13

0.84

13

10

0.68

128

1.57

138

LIP

AD1100-1476

2

0.75

11

3.35

13

22

0.46

308

1.81

330

Tiwanaku

AD500-1100

3

0.80

37

1.49

40

50

0.54

565

2.23

615

Late Formative

400BCE-AD500

9

0.84

102

2.19

111

91

0.47

859

2.19

950

Formative C

900-400 BCE

19

1.21

272

2.44

291

144

0.46

1157

1.39

1301

Formative B

1500-900 BCE

   

2

 

2

85

0.58

525

1.73

610

Formative A

2000-1500 BCE

6

0.93

32

1.49

38

160

0.53

1057

1.37

1217

Term. Archaic

3300-2000 BCE

12

0.99

58

3.00

70

79

0.79

403

1.79

482

Late Archaic

5000-3300 BCE

5

1.57

36

3.57

41

18

0.56

147

1.78

165

Middle Archaic

7000-5000 BCE

2

0.20

33

7.26

35

37

0.60

674

2.76

711

Total

58

1.05

596

2.87

654

696

0.55

5823

1.84

6519

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 3-6. Qillqatani periods by tools (bifacially flaked) and debitage (all other lithics), in obsidian and non-obsidian categories.

 


Excavations in the two blocks at Qillqatani revealed a switch from hunting and gathering to a predominantly pastoral economy between the occupation in level 25, and that of level 24 that was stratigraphically superior (Aldenderfer 2005: 20;). The occupation in Level 24 appears to have been the first residential occupation, and it is considerably thicker than were previous levels that appeared to have been logistical in nature. The ovoid structures of Level 24 are slightly larger and are free standing, while in the preceding levels the structures are against the rear wall of the rock shelter. Level 24 is the first level with ceramics, but it is being considered Terminal Archaic in this analysis due to economic evidence and the exceptionally early ceramics at Qillqatani.

Qillqatani Period

Weight in Grams

Total Count

0 - 1 g

1 - 2 g

2 - 3 g

3 - 4 g

4 - 5 g

Late Horizon

9

 

1

   

10

LIP

22

       

22

Tiwanaku

44

5

1

   

50

Late Formative

79

8

4

   

91

Formative C

129

11

2

2

 

144

Formative B

71

8

4

1

1

85

Formative A

135

17

5

1

2

160

Terminal Archaic

58

12

5

4

 

79

Late Archaic

13

4

1

   

18

Middle Archaic

29

4

2

2

 

37

Total Count

589

69

25

10

3

696

Table 3-7. Counts of obsidian debitage at Qillqatani by weight (g).


The earliest obsidian at Qillqatani is a Middle Archaic sample from an unknown source. In the Late Archaic, Chivay obsidian begins to appear at the rock shelter. Subsequently, during the Terminal Archaic obsidian from Chivay occurs in relatively large numbers and it persists until the end of the Early Formative (the Qillqatani Formative Cperiod) where chemical testing of ten obsidian samples reveals there is greater heterogeneity in obsidian procurement. In this period, Chivay obsidian makes up 60% of the obsidian tested by the Missouri University Research Reactor (MURR), the Tumuku type makes up 20%, and the Aconcahua type and Alca type make up the remaining 10% (one sample of each).

Three obsidian artifacts from two proveniences at Qillqatani, West level XI and East level XIV, were found to belong to the Tumuku chemical group, a group that derives from an as-yet-unlocated source that probably lies in the southern department of Puno. This chemical group has not yet been well characterized, as no source samples are available and the samples analyzed by NAA in the 1970s at Lawrence Berkeley Labs (Browman 1998: 309-311; Burger and Asaro 1977) are not easily comparable with more recent NAA results from MURR. As a consequence, in initial studies of these three Qillqatani artifacts it was proposed that the artifacts belong to a subgroup from the Alca obsidian source in northern Arequipa, a subgroup that was referred to as "Alca-2" (Frye, et al. 1998) and "Alca-Z" (Jennings and Glascock 2002: 111). More recently, Michael Glascock at MURR has stated that these three Qillqatani samples probably derive from the Tumuku source (M. Glascock, March 2006, pers. comm.).

Flake sizes at Qillqatani indicate that relatively large flakes were being discarded (Table 3-7), particularly during the Terminal Archaic and Early to Middle Formative. A central question concerning obsidian circulation is to what degree were flakes used for shearing and butchering tasks? Were flakes sufficiently large to be hand-held for these activities? Length measurements from these flakes from Qillqatani are not available, but an estimate of the size of those flakes based on their weight is provided by comparing similar obsidian flakes from the Chivay source dataset. An obsidian flake weighing 4g from the Chivay dataset had the following dimensions: 45 x 13 x 7mm. A smaller obsidian flake weighing 3g measured 31 x 14 x 6mm. These flakes appear to have been sufficiently large for shearing and butchering tasks. Further technical studies, as well as use wear and residue analysis, may shed more light on the use of large obsidian flakes in the regional consumption zone.

Small quantities of material and regional models of exchange

The actual volume or weight of obsidian at Qillqatani is relatively small. Obsidian from the Chivay source appears in small quantities in nearly every stratum in the approximately 8000 year sequence. The most informative data on long distance exchange come not from the total mass of obsidian, but from the variability in the relative percentage of obsidian flaked and obsidian tools in each lithic assemblage through the sequence. Nevertheless, the weight of obsidian tools at Qillqatani totals 43 g, and the sum of the weight of obsidian flakes is 382 g out of a total of 11,085 g of lithic material. Thus, the entire quantity of obsidian excavated at Qillqatani is only about 1.5% of the cargo that could be carried by a single llama.

These figures are meant to highlight a central issue with obsidian studies overall: the actual quantities of obsidian encountered and evaluated from the consumption sites throughout the south-central Andes are relatively low. The significance of obsidian circulation over the larger region is not matter of weight or volume, but rather a question of consistency and changes in the proportions of particular sources utilized over time. These data from Qillqatani underscore this issue. A comparison of the persistence of non-local obsidian at Qillqatani as of level 24 (X

Table 3-6XandXTable 3-7X) with the non-local obsidian at Asana (XTable 3-4X) during earlier periods of the Archaic, suggests that on a regional scale mechanisms of exchange, or direct acquisition, were more intermittent during the earlier Asana phases. In contrast, Qillqatani has high quality cherts and low quality Aconcahua type obsidian available in the immediate proximity of the rock shelter. Thus, the question becomes: why transport Chivay obsidian 200 km when alternative materials are locally available? Further, why was the transmission of Chivay obsidian so consistent through time? In this perspective the low but consistent quantities of Chivay obsidian that were conveyed throughout the south-central Andean highlands during the prehispanic period can be seen as a gauge of highland interaction and horizontal complementarity, with wider implications for exchange.

3.4.3. Sumbay

The work of Máximo Neira Avendaño (1990;1968) is distinguished as being the earliest systematic Archaic Period excavations in the Arequipa highlands. In the mid-1960s Neira excavated at seven preceramic sites close to the Sumbay train station, including several rock shelters, known as Sumbay-1 through Sumbay-7. The sites were later renamed "Ccollpa-Sumbay" by Eloy Lináres Malaga in 1984 (1990;1992) as part of the CONCYTEC survey.

The Sumbay area lies 42 km to the south-east of the Chivay source across the pampa and it is 9.3 hours from the obsidian source area by the hiking model. The main cavern, SU-3, is a rock shelter that is concealed in narrow canyon that cuts through the puna. This rock shelter measuring 15m across, 11m deep, and 6m in height at the dripline, was badly looted in the 1930s, and Neira's excavations focused on the remaining intact portions of the cave. The cave is known for exceptional rock art panels featuring both petroglyphs, ochre pictographs, and a variety of animal species including elongated camelids, a hunting puma, humanoid figures, and surithe Andean ostrich.

Seven excavation pits were placed in the main shelter, SU-3. Pit 5 produced obsidian samples in every level along with a large number of tools made from pitchstone, a dull vitreous material formed from weathered obsidian that has absorbed water from the environment. Pitchstone has 4-10% water while obsidian has 0.1 - 0.5% water (M. Glascock, 2006 pers. comm.). The source of this pitchstone is probably somewhere near Sumbay and further study of this pitchstone may provide an interesting complement to the chemical characterization of obsidian.

/misc/image009.jpg

Figure 3-8. Sumbay pitchstone projectile points.

Titicaca Chronology

Sumbay

Stratum

14C yr bp

Lab # (Bonn)

Cal.BCE

Obsidian Type

Artifacts

1

None

Many very small flakes.

Late Archaic

5000-3300 BCE

2

5350±90

1559

4350-3980

One pitchstone knife, 5 broken pitchstone points, 1 quartzite scraper, 100 flakes.

3

6160±120

1558

5400-4750

Two obsidian samples (Chivay)

One pitchstone foliate point with concave base, 4 pitchstone scrapers, 6 broken pitchstone points, 1 broken obsidian point, 62 flakes.

Middle Archaic

7000-5000 BCE

4

None

One obsidian sample (Chivay)

Six pitchstone points: 2 incomplete stemmed with concave base, 1 almost complete, 3 foliate points, one with broken tip and broken base. Seven incomplete pitchstone points, 2 incomplete quartzite points. One pitchstone knife, 110 flakes, 1 worked bone, 5 bone concentration.

Table 3-8. Sumbay, SU-3 Pit 5. Strata with obsidian samples and associated artifacts(Neira Avendaño 1990: 32-33).

Twenty-five obsidian samples were analyzed from the Sumbay area. Twenty samples from the surface and terreplain of the rock shelter SU-2, two from the surface of the rock shelter SU-3, and 3 from excavations in SU-3, Pit 5 (Burger, et al. 1998: 209;Burger, et al. 2000: 278). All samples turned out to be of the Chivay type. Since stratum 3 was dated to the Middle - Late Archaic transition, the stratum 4 obsidian sample is stratigraphically below than that, so it is probably Middle Archaic in date.

3.4.4. The Ilave Valley and Jiskairumoko

Located in the Department of Puno in the western Lake Titicaca Basin, the Ilave river valley is an open, terraced river valley and it forms the highest volume river drainage to flow into Lake Titicaca from the west. Jiskairumoko (95-189) is the largest multicomponent Archaic/Formative site identified during survey and it lies 200 km from the Chivay obsidian source or 44 hours travel time across the expansive puna grasslands. Mark Aldenderfer conducted research in the Ilave valley from 1994 to 2002 including a pedestrian survey, a testing program, and excavation work (Aldenderfer 1997;Aldenderfer 1998). In 1997 and 1998 Cindy Klink conducted research in the Huenque drainage, a principal tributary that joins the Ilave from the south (Klink 2005;Klink 2006;Klink and Aldenderfer 1996). Nathan Craig excavated at the site of Jiskairumoko and tested at numerous other sites between 1999 and 2002 (Craig 1999;Craig 2005;Craig and Aldenderfer 2002;Craig and Aldenderfer In Press). Tripcevich conducted a viewshed analysis of sites in the Ilave drainage using data from the 1994 and 1995 Ilave valley survey (Tripcevich 2002).

IlaveValley

In the Ilave valley, obsidian was scarce prior to 3300 BCE, but it appears in a number of Terminal Archaic and Formative contexts after that date. Diagnostic projectile points from the Ilave area reveal a dramatic change in material type with the Terminal Archaic.

/misc/image010.jpg

Figure 3-9. Comparison of projectile point counts in the Ilave Valley and the Upper Colca.

Using only diagnostic projectile points from the Klink and Aldenderfer (2005) point typology, these data reveal a shift to greater use of obsidian with series 5 projectile points. Following the point typology, all series 1 through 4 points are diagnostic to the Terminal Archaic or earlier, except for types 4C and 4E which have been excluded from this analysis. The lower part ofXFigure 3-9Xreveals data classified into the same three groups, but with data from the Chivay obsidian source area resulting from the 2003 Upper Colca project. Comparing these two datasets reveals that with the advent of Series 5 points in the Terminal Archaic after 3300 BCE there is a sudden upswing in obsidian use in the Ilave consumption zone that corresponds perfectly with a dramatic shift in projectile point production at the Chivay source area itself. There appear to have been pan-regional changes occurring with the widespread adoption of series 5 style projectile points, the use of obsidian, and these changes are possibly related to the greater use of the bow and arrow.

Jiskairumoko (95-189)

The site of Jiskairumoko was excavated using a broad, horizontal décapage technique between the years 1999 and 2002, and Craig's (2005) dissertation forms the site archive. Radiocarbon dates fromexcavation work at Jiskairumoko range from the Late-Terminal Archaic transition with a date of 4562±73bp(AA58476; 3520-3020 BCE)through to the end of the Early Formative, with a date of3240±70bp (Beta-97321; 1690-1390 BCE). Note that Craig (2005) has the Terminal Archaic dating to 3000-1500 BCE, while in the Upper Colca Project and in this dissertation the period dates to 3300 - 2000 BCE All references to the "Terminal Archaic" have been adjusted to the latter time range in this document unless otherwise noted.

Craig and Aldenderfer chemically characterized 68 bifacially-flaked obsidian tools from excavated contexts at Jiskairumoko (96% of all obsidian tools from Jiskairumoko) by sending these items to M. Steven Shackley at the UC Berkeley Archaeological XRF Lab(Craig 2005: 513, 908-916). The samples were compared with four geological samples that provided to Shackley from nodules that I had collected from Chivay source in 2003. Three of the nodules provided to Shackley were from the Maymeja area and one was from east of Cerro Hornillo. The XRF results showed that 97% of the Jiskairumoko obsidian tools (n = 66) were from the Chivay source and 3% (n = 2) were from the Alca source. These values diverge slightly from obsidian type distributions in the Titicaca Basin more generally (XTable 3-3X), where 90.5% (n = 466) of all of the obsidian artifacts tested to date from the Titicaca Basin are Chivay type. These data indicate that the people at Jiskairumoko were more intensively using Chivay obsidian in the Terminal Archaic and Early Formative than were Titicaca Basin residents over all, especially in contrast to the variety in obsidian types that emerge from samples dating to later times.

Obsidian artifacts from excavations at Jiskairumoko reveal that obsidian was used in similar proportions for projectile points from excavated contexts as for points from surface contexts in the Ilave valley. Craig(2005: 685)observes that 18% (n = 54) of the excavated Jiskairumoko projectile points are made from obsidian. He also notes that 50% of these have edge modification in the form of serration or denticulation while only 15% of non-obsidian points have edge treatment, a statistically very significant pattern that he attributes to the symbolic importance of this material. Obsidian was found, along with other lithics and a carved camelid effigy, in Burial 1 at Jiskairumoko in the grave of an elderly adult female with cranial deformation, a primary deposit dating to the Terminal Archaic or 3019-2859 cal BCE(Craig 2005: 680-682). Graves excavated in the Ilave valley area also contain a variety of non-local grave goods including obsidian, lapis, and gold, but non-local grave goods only occur in contexts dating to the Terminal Archaic and later.