The Switchback Site

1

1-x-1 meter grid unit 1411N 216E. South-central portion of the site. Located just south of the center of the midden (Nonstructure 101), approximately 23 m south of Structure 110.

Random. Second 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Sterile sediment was encountered at approximately 109.22 m. However, excavation continued for roughly 30 cm into the undisturbed native sediment for future geomorphological testing. Excavation was terminated at an elevation of approximately 108.96 m.

2

1-x-1 meter grid unit 1402N 201E. Southwest quarter of the site. Located in the southwest portion of the midden (Nonstructure 101), approximately 30 m south of Structure 110.

Random. First 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 110.32 m. A 10 cm x 10 cm window was dug into the southwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 110.24 m.

3

1-x-1 meter grid unit 1400N 206E. Southwest quarter of the site. Located in the southwest portion of the midden (Nonstructure 101), approximately 32 m south of Structure 110.

Random. Sixth 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 110.12 m. A 10 cm x 10 cm window was dug into the southwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 110.07 m.

4

1-x-1 meter grid unit 1406N 209E. Southwest quarter of the site. Located in the southwest portion of the midden (Nonstructure 101), approximately 26 m south of Structure 110.

Random. Twentieth 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 109.95 m. A 15 cm x 15 cm window was dug into the northwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 109.87 m.

5

1-x-1 meter grid unit 1405N 219E. Southeast quarter of the site. Located in the southeast portion of the midden (Nonstructure 101), approximately 28 m south of Structure 110.

Random. Fourth 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 109.04 m. A 10 cm x 10 cm window was dug into the northeast corner of the unit to confirm sterility; the bottom of this window was at an elevation of 108.93 m.

6

1-x-1 meter grid unit 1411N 214E. South-central portion of the site. Located just south of the center of the midden (Nonstructure 101), approximately 21 m south of Structure 110.

Random. Tenth 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 109.40 m. A 10 cm x 10 cm window was dug into the southeast corner of the unit to confirm sterility; the bottom of this window was at an elevation of 109.28 m.

7

1-x-1 meter grid unit 1411N 197E. Southwest portion of the site. Located near the southwest border of the midden (Nonstructure 101), approximately 24 m southwest of Structure 110.

Random. Twelfth 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 110.48 m. A 13 cm x 13 cm window was dug into the northwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 110.37 m.

8

1-x-1 meter grid unit 1418N 201E. Southwest quarter of the site. Located near the west border of the midden (Nonstructure 102), approximately 17 m southwest of Structure 110.

Random. Eighteenth 1-x1-m unit selected for excavation in Nonstructure 101. Note that the Study Unit for this Excavation Unit was later changed to Nonstructure 102 due to the presence of modern chaining disturbance.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 110.63 m. A 20 cm x 20 cm window was dug into the northeast corner of the unit to confirm sterility; the bottom of this window was at an elevation of 110.53 m.

9

1-x-1 meter grid unit 1416N 207E. Southwest quarter of the site. Located just west of the center of the midden (Nonstructure 102), approximately 16 m south of Structure 110.

Random. Eleventh 1-x1-m unit selected for excavation in Nonstructure 101. Note that the Study Unit for this Excavation Unit was later changed to Nonstructure 102 due to the presence of modern chaining disturbance.

Strata subdivided into arbitrary levels. Stratum 2 was divided into two levels (Level 1 was terminated arbitrarily at a depth of 10 cm).

Undisturbed native sediment. Excavation was terminated at approximately 110.17 m. A 20 cm x 20 cm window was dug into the southwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 110.10 m.

10

1-x-1 meter grid unit 1420N 214E. Near the center of the site. Located in the northwest portion of the midden (Nonstructure 101), approximately 13 m south of Structure 110.

Random. Eighth 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 109.60 m. A 10 cm x 10 cm window was dug into the southwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 109.59 m.

11

1-x-1 meter grid unit 1423N 214E. Near the center of the site. Located in the north-central portion of the midden (Nonstructure 101), approximately 9 m south of Structure 110.

Random. Seventh 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 109.53 m. A 10 cm x 10 cm window was dug into the southwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 109.43 m.

12

1-x-1 meter grid unit 1431N 221E. Northeast quarter of the site. Located in the northeast quarter of the midden (Nonstructure 101), approximately 9 m southeast of Structure 110.

Random. Thirteenth 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 109.12 m. No test window was dug in this unit.

13

1-x-1 meter grid unit 1422N 210E. Just west of the center of the site. Located in the northwest quarter of the midden (Nonstructure 101), approximately 10 m south of Structure 110.

Random. Nineteenth 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 109.96 m. An 11 cm x 13 cm window was dug into the southwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 109.84 m.

14

1-x-1 meter grid unit 1422N 212E. Just west of the center of the site. Located in the northwest quarter of the midden (Nonstructure 101), approximately 10 m south of Structure 110.

Random. Twenty-fifth 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 109.75 m. A 10 cm x 10 cm window was dug into the southwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 109.64 m.

15

1-x-1 meter grid unit 1421N 213E. Near the center of the site. Located in the north-central portion of the midden (Nonstructure 101), approximately 11 m south of Structure 110.

Random. Twenty-eighth 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 109.67 m. A 20 cm x 20 cm window was dug into the southwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 109.63 m.

16

1-x-1 meter grid unit 1427N 224E. Northeast quarter of the site. Located in the northeast quarter of the midden (Nonstructure 101), approximately 15 m southeast of Structure 110.

Random. Thirtieth 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 108.85 m. A 20 cm x 20 cm window was dug into the northeast corner of the unit to confirm sterility; the bottom of this window was at an elevation of 108.75 m.

17

1-x-1 meter grid unit 1419N 223E. Southeast quarter of the site. Located just east of the center of the midden (Nonstructure 101), approximately 18 m southeast of Structure 110.

Random. Seventeenth 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 108.99 m. A 15 cm x 20 cm window was dug into the northwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 108.93 m.

18

1-x-1 meter grid unit 1416N 225E. Southeast quarter of the site. Located in the east-central portion of the midden (Nonstructure 101), approximately 21 m southeast of Structure 110.

Random. Sixteenth 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 108.75 m. A 10 cm x 10 cm window was dug into the northwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 108.70 m.

20

1-x-1 meter grid unit 1403N 216E. South-central portion of the site. Located in the south-central portion of Nonstructure 101, approximately 29 m south of Structure 110.

Random. Fifth 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 109.27 m. A 10 cm x 10 cm window was dug into the southeast corner of the unit to confirm sterility; the bottom of this window was at an elevation of 109.22 m.

21

1-x-1 meter grid unit 1406N 222E. Southeast quarter of the site. Located in the southeast portion of the midden (Nonstructure 101), approximately 28 m southeast of Structure 110.

Random. Ninth 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 108.74 m. A 10 cm x 10 cm window was dug into the northwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 108.69 m.

22

1-x-1 meter grid unit 1413N 197E. Southwest quarter of the site. Located near the west border of the midden (Nonstructure 101), approximately 23 m southeast of Structure 110.

Random. Twenty-third 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 110.55 m. A 15 cm x 10 cm window was dug into the southwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 110.43 m.

23

1-x-1 meter grid unit 1420N 206E. Southwest quarter of the site. Located in the northwest portion of the midden (Nonstructure 102), approximately 12 m south of Structure 110.

Random. Twenty-second 1-x1-m unit selected for excavation in Nonstructure 101. Note that the Study Unit for this Excavation Unit was later changed to Nonstructure 102 due to the presence of modern chaining disturbance.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 110.33 m. A 10 cm x 10 cm window was dug into the southeast corner of the unit to confirm sterility; the bottom of this window was at an elevation of 110.26 m.

24

1-x-1 meter grid unit 1415N 209E. Southwest quarter of the site. Located just west of the center of the midden (Nonstructure 102), approximately 17 m south of Structure 110.

Random. Twenty-ninth 1-x1-m unit selected for excavation in Nonstructure 101. Note that the Study Unit for this Excavation Unit was later changed to Nonstructure 102 due to the presence of modern chaining disturbance.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 109.96 m. A 20 cm x 20 cm window was dug into the northwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 109.91 m.

25

1-x-1 meter grid unit 1416N 208E. Southwest quarter of the site. Located just west of the center of the midden (Nonstructure 102), approximately 16 m south of Structure 110.

Random. Twenty-fourth 1-x1-m unit selected for excavation in Nonstructure 101. Note that the Study Unit for this Excavation Unit was later changed to Nonstructure 102 due to the presence of modern chaining disturbance.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 110.09 m. A 20 cm x 20 cm window was dug into the northwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 110.04 m.

26

1-x-1 meter grid unit 1419N 231E. Southeast quarter of the site. Located in the east-central portion of the midden (Nonstructure 101), approximately 24 m southeast of Structure 110.

Random. Fourteenth 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 108.30 m. A 10 cm x 10 cm window was dug into the southwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 108.21 m.

27

1-x-1 meter grid unit 1420N 225E. Southeast quarter of the site. Located in the east-central portion of the midden (Nonstructure 101), approximately 21 m southeast of Structure 110.

Random. Twenty-first 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 108.88 m. A 10 cm x 10 cm window was dug into the northeast corner of the unit to confirm sterility; the bottom of this window was at an elevation of 108.80 m.

28

1-x-1 meter grid unit 1425N 230E. East-central portion of the site. Located in the northeast quarter of the midden (Nonstructure 101), approximately 20 m southeast of Structure 110.

Random. Twenty-seventh 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 108.19 m. A 15 cm x 15 cm window was dug into the southwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 108.18 m.

29

1-x-1 meter grid unit 1424N 235E. Near the center of the east boundary of the site. Located in the northeast quarter of the midden (Nonstructure 101), approximately 25 m southeast of Structure 110.

Random. Third 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 107.75 m. A 10 cm x 10 cm window was dug into the northwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 107.62 m.

31

1-x-1 meter grid unit 1431N 233E. Northeast quarter of the site. Located in the northeast quarter of the midden (Nonstructure 101), approximately 20 m east of Structure 110.

Random. Twenty-sixth 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 108.55 m. A 10 cm x 10 cm window was dug into the northwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 108.51 m.

32

1-x-1 meter grid unit 1398N 206E. Southwest quarter of the site. Located near the south border of the midden (Nonstructure 101), approximately 34 m south of Structure 110.

Random. Fifteenth 1-x1-m unit selected for excavation in Nonstructure 101.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 110.08 m. A 15 cm x 15 cm window was dug into the northwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 110.01 m.

33

2-x-2 meter grid unit 1440N 201E. Northwest quarter of the site. Located north of the midden (Nonstructure 101) and approximately 8 m northwest of the pit structure (Structure 110).

Judgmental. This unit was selected to investigate the north side of the roomblock (Structure 113).

Strata subdivided into arbitrary levels. Strata were subdivided into 25-cm levels when applicable.

Structure floor. The structure floor was encountered at an elevation of approximately 110.62 m. Fill continued into Features 1, 2, and 3.

34

1-x-2 meter grid unit 1403N 214E. South-central portion of the site. Located in the south-central portion of Nonstructure 101, approximately 26 m south of Structure 110.

Judgmental. This unit was placed over a rock concentration identified as a feature during survey.

Natural strata. The 2-x1-m unit was bisected into east and west halves. The east half was excavated first and Feature 1 was profiled; then the west half was excavated.

Undisturbed native sediment. In the east half, excavation was terminated at approximately 109.40 m. A 20 cm x 20 cm window was dug into the southwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 109.33 m. In the west half, excavation was t

35

2-x-1 meter grid unit, long axis oriented north-south 1404N 214E. South-central portion of the site. Located in the south-central portion of Nonstructure 101, approximately 23 m south of Structure 110.

Judgmental. This unit was placed over a rock concentration identified as a feature during survey.

Surface collection.

Modern ground surface. No excavation took place in this unit. The modern ground surface was at an elevation of approximately 109.48 m.

36

2-x-2 meter grid unit 1429N 222E. Northeast quarter of the site. Located in the northeast quarter of Nonstructure 101, approximately 11 m southeast of Structure 110.

Judgmental. This excavation unit was selected in order to investigate several upright sandstone slabs that were visible on the modern ground surface. These slabs likely formed part of a check dam and were recorded as Feature 1.

Natural strata.

Undisturbed native sediment. Excavation was terminated at approximately 109.05 m. A 25 cm x 25 cm window was dug into the northwest corner of the unit to confirm sterility; the bottom of this window was at an elevation of 109.00 m.

37

2-x-2 meter grid unit 1436N 210E. North-central portion of the site. Located north of the midden (Nonstructure 101) and approximately 8 m southeast of the slab-lined room in the roomblock (Structure 113).

Judgmental. This unit was selected to test the main chamber of a pithouse (Structure 110) based on the augering transects.

Strata subdivided into arbitrary levels. Strata were subdivided into 25-cm levels when applicable.

Structure floor. The structure floor was encountered at an elevation of approximately 108.97 m. Fill continued into Features 1, 3, 6, 7, and 8.