Stratigraphy

The local test unit datum for both of these units was placed on a large, flat rock that is part of the A03-558 oval that lies just to the south of TU3. This mapping station, as well as the site datum north, are shown in Figure 7-32 in the positions where they were mapped with a total station in 2004.

Level	H.B.D.*	Contents	Soil	Photo #
1	5	Top surface. Roots	Fine sandy volcanic soil, roots from low brush	2638
2	12.5	F1: NW of rocks, 0a: matrix. Roots	V. Dk Grey/Brown 10YR3/2, fine grain, sub-angular,poorly sorted .7/.5	2641
3	17.5	F1, F2, 0a. Roots	Dark brown 7.5YR4/2, subangular blocky, med grain, poorly sorted, .7/.3	2646
4	32	F1: midden, indoor? F3: light, sterile Roots, lithics, ceramics	F1: V. Dk Grey/Brown 10YR3/2 Fine grain, subrounded, well-sorted, .9/.7; F3: Brown 7.5YR4/3, med grain, poorly sorted, .9/.5	2650-2651
5	44	F1	Dark brown 7.5YR4/2, subangular blocky, med grain, poorly sorted, .9/.5	2661-2663
6	56	F1a, F3 Lg chert flake lying flat, organic soil	F1a: Dark brown 7.5YR3/2, med grain, well sorted, .9/.7; F3: Brown 7.5YR4/3, med grain, poorly sorted, .9/.3	2664, 3035-3414
* HBD = mean height below datum in centimeters for the top of each level based on five depth measurements.

Table 7-27. A02-39u3 test unit. Excavation levels, overview, and soil description.

Level	H.B.D	Contents	Soil	Photos
1	3	S1: Top surface Rocky soil, obsidian and non-diagnostic ceramics	Compacted, roots.	2649
2	14	S2: F1: N side; F2: S side Rocks and roots, fewer artifacts	F1: Dark brown 7.5YR3/2, silty sand,med grain, poorly sorted, .7/.5	2665
3	23	S3: F1, F2 Yellowish grey wall mortar. Black-on-red sherd in wall.	Dark brown 7.5YR3/2, silty sand, subangular blocky, med grain, poorly sorted, .9/.3	2680
4	32	S3: F1, F2 Small charcoal pieces. Greyish brown poss. Midden.¹⁴C: 1822±37 bp	F1: Alluvial, V. Dk Grey/Brown: 10YR3/2, silty sand, med grain, poorly-sorted,.9/.3. F2: Dk brown 7.5YR3/2, silt, subangular blocky, fine grain, poorly-sorted, .9/.3	3012
5	37	S4: F1,F2,F3 Less compact, carbon, ceramic, bone, charcoal, much obsidian.	F1: V. Dk Grey 7.5YR4/1, subangular blocky, coarse, poorly sorted, .9/.7	3016
6	49	S5: F1,F2,F3 Less compact, carbon, ceramic, bone, charcoal.¹⁴C: 1698±31 bp	Dark brown 7.5YR3/2, silty clay, subangular blocky, poorly sorted. F1: fine grain .9/.3, F2: coarse grain, .9/.3, F3: med grain, .9/.3	3033-3034. 3416-3417
7	58	S5: F4. Hearth only. Compact, fine clayey soils around hearth.	Dark brown 7.5YR3/2, silty clay, fine grain, subangular blocky, poorly sorted, .5/.5	3423
8	68	S5: F4. Hearth only. Compact, fine clayey soils around hearth. Torquoise.	Dark brown 7.5YR3/2, silty clay, fine grain, subangular blocky, poorly sorted, .5/.5	3424-3425
9	80	S5: F4. Hearth only. Compact, fine clayey soils around hearth.	Dark brown 7.5YR3/2, silty clay, fine grain, subangular blocky, poorly sorted, .5/.5	3426-3427
* HBD = mean height below datum in centimeters for the top of each level based on five depth measurements.

Table 7-28. A02-39u4 test unit. Excavation levels, overview, and soil description.

Figure 7-33. A02-39u4 Pausa test unit west profile diagram showing strata and levels.

Radiocarbon dates recovered from levels 3 and 5 of Unit 4 are temporally inverted, but they overlap in the 2-sigma error ranges. These dates place the later use of the hearth in the vicinity of AD200, or the Upper Formative. At units 3 and 4 at Pausa showed a relatively high percentage of obsidian by count throughout the sequence (83%), although by weight obsidian was somewhat less dominant (58%), while volcanics became more prominent (33%).