Table T4. Type 2, Type 3, and Type 4 ash layers.
Type 2 layers
Type 3 layers
Type 4 layers
Core, section,
interval (cm)
Age
Core, section,
interval (cm)
Age
Core, section,
interval (cm)
Age
201-1227A- 201-1227A- 201-1227A-
2H-CC, 22.5–23 Pliocene 1H-2, 5.7 Holocene 1H-4, 56 Holocene
3H-1, 116–117.3 Pliocene 1H-2, 110.4 Pleistocene 4H-5, 73 Pliocene

1H-4, 56 Pleistocene 4H-6, 29.3 Pliocene
1H-4, 63 Pleistocene 4H-6, 87 Pliocene
1H-4, 78 Pleistocene 5H-1, 14 Pliocene
2H-1, 5.8 Pleistocene 6H-3, 135 Pliocene
3H-1, 62.2 Pleistocene 6H-3, 137.3 Pliocene
11H-1, 78.5 Miocene 7H-1, 14 Pliocene
12H-1, 82.5 Miocene 7H-1, 150 Pliocene

7H-2, 3 Miocene
7H-2, 6 Miocene
13H-3, 7–105 Miocene
201-1228A- 201-1228A- 201-1228A-
1H-1, 98.5–99.3 Holocene 2H-4, 111.2–111.4 Pleistocene 5H-5, 134–150 Pleistocene
1H-1, 121.8–122.6 Holocene 2H-4, 131.7 Pleistocene 6H-1, 84 Pleistocene
1H-2, 7.8–8.3 Holocene 2H-4, 138.6 Pleistocene 7H-1, 27.5–31.7 Pliocene
2H-3, 122.5–123.5 Pleistocene 2H-5, 28–30 Pleistocene 7H-3, 117–135 Pliocene
2H-6, 121.1–121.6 Pleistocene 2H-5, 29.8* Pleistocene 7H-4, 10–14.8 Pliocene
3H-5, 121–124.5 Pleistocene 2H-7, 33.3–36 Pleistocene 7H-4, 126 Pliocene
3H-5, 35.3–38.3 Pleistocene 3H-3, 14–14.5 Pleistocene 8H-1, 123 Pliocene
3H-5, 106.8–107.4 Pleistocene 5H-2, 122–131 Pleistocene 9H-1, 62–70 Pliocene
3H-5, 112.5–113.5 Pleistocene 6H-4, 4 Pleistocene 9H-1, 80.5–93.5 Pliocene
3H-6, 149.3–150 Pleistocene 6H-4, 14–24 Pleistocene 9H-1, 73–78.5 Pliocene
3H-7, 0–2 Pleistocene 6H-4, 80 Pleistocene 9H-2, 112.7 Pliocene
4H-6, 84–85 Pleistocene 6H-6, 60 Pleistocene
5H-2, 110–121.5 Pleistocene Dispersed throughout the rest of this core. Pliocene
5H-2, 131–136 Pleistocene
5H-5, 70–134 Pleistocene
6H-1, 46 Pleistocene
6H-1, 77.5–82 Pleistocene
6H-4, 0–14 Pleistocene
7H-1, 26–35 Pliocene
7H-5, 84.5–87.2 Pliocene
7H-6, 8-12 Pliocene
7H-6, 136.5 Pliocene
8H-1, 87.5 Pliocene
8H-2, 23.8 Pliocene
8H-5, 36 Pliocene
8H-5, 41 Pliocene
8H-5, 48.3 Pliocene
8H-6, 81.5 Pliocene
201-1229A- 201-1229A- 201-1229A-
1H-2, 68–72.4 Holocene 1H-2, 98–99.6 Holocene 5H-4, 115–117 Pleistocene
2H-3, 117.2 Pleistocene 2H-6, 7–16 Pleistocene 6H-3, 26.2–28 Pleistocene
2H-5, 133–135 Pleistocene 2H-6, 77–80 Pleistocene 6H-3, 55–65 Pleistocene
2H-6, 0–7 Pleistocene 3H-6, 142–146 Pleistocene 10H-5, 44–52 Pleistocene
2H-6, 17.5–19* Pleistocene 5H-6, 20–38 Pleistocene 10H-5, 52–59 Pleistocene
2H-6, 21.3–22.5* Pleistocene 8H-1, 40–55 Pleistocene 11H-4, 28–33.5 Pleistocene
2H-6, 75.5–77 Pleistocene 8H-1, 86.5* Pleistocene 11H-5, 85–87 Pleistocene
2H-7, 9–34 Pleistocene 8H-1, 83.5–84* Pleistocene 11H-5, 124 Pleistocene
3H-6, 83–88.8 Pleistocene 8H-2, 145–149 Pleistocene 13H-CC, 15–16 Pleistocene
5H-4, 71–77 Pleistocene 9H-4, 81–88 Pleistocene 14H-3, 111.8–112.4 Pleistocene
8H-3, 111.5–113* Pleistocene 12H-5, 43.5–56.5 Pleistocene 14H-4, 97–98 Pleistocene
9H-2, 104–114 Pleistocene 12H-6, 43.4–43.6 Pleistocene 14H-4, 98–104.5 Pleistocene
9H-2, 116–129 Pleistocene 14H-1, 42–56.5 Pleistocene 14H-4, 132(134)–137.5 Pleistocene
9H-2, 129–131.5 Pleistocene 14H-3, 126.5–134.5 Pleistocene 14H-5, 43.5–46.5 Pleistocene
9H-2, 131.5–134 Pleistocene 14H-4, 68–78.5 Pleistocene 14H-5, 46.5–50 Pleistocene
9H-2, 134–136 Pleistocene 14H-4, 141.4–141.5 Pleistocene 14H-5, 56–60.5 Pleistocene
9H-4, 21–30 Pleistocene 14H-5, 116.5–122.5 Pleistocene 14H-5, 62.2–86.7 Pleistocene
9H-4, 51–53 Pleistocene 14H-CC, 20–32 Pleistocene 14H-5, 124–136 Pleistocene
9H-4, 58* Pleistocene 18H-1, 97–100 Pliocene 14H-6, 68.5–72.6 Pliocene
9H-4, 65–66* Pleistocene 18H-3, 6(4)–15 Pliocene 18H-2, 127–128.8
9H-4, 68–72 Pleistocene 18H-3, 122–124 Pliocene    
9H-4, 88–92 Pleistocene    
9H-4, 110–115 Pleistocene
9H-4, 111–111.5* Pleistocene
9H-4, 117.5–120 Pleistocene
9H-4, 118.8* Pleistocene
10H-3, 40–41 Pleistocene
11H-3, 2–6.5 Pleistocene
11H-3, 30–32 Pleistocene
11H-3, 39.3–39.6 Pleistocene
11H-4, 0–7.5 Pleistocene
11-4, 7.5–23.5 Pleistocene
11-4, 73–75 Pleistocene
11-4, 77.5–81 Pleistocene
11-5, 63–66 Pleistocene
11-5, 50–60 Pleistocene
11-5, 132.5–134 Pleistocene
11-5, 68.5–69 Pleistocene
11-5, 69–85 Pleistocene
11-5, 107.5–115.5 Pleistocene
11-6, 0–3 Pleistocene
11H-6, 5-9 Pleistocene
11H-6, 9–11.3 Pleistocene
11H-6, 11.3–11.5 Pleistocene
11H-6, 13.5–15 Pleistocene
11H-6, 15–16.5 Pleistocene
11H-6, 29.5–35 Pleistocene
11H-6, 39–40 Pleistocene
11H-6, 40–42 Pleistocene
11H-6, 114.1–114.3 Pleistocene
12H-1, 116–126.5 Pleistocene
12H-4, 31–34.5 Pleistocene
14H-1, 85–88.2 Pleistocene
14H-1, 120.5–124.5 Pleistocene
14H-3, 108.5–111.8 Pleistocene
14H-4, 48–49 Pleistocene
14H-4, 78.5–86 Pleistocene
14H-4, 139.5–141.4 Pleistocene
14H-4, 146.5–150 Pleistocene
14H-5, 0–19.5 Pleistocene
14-5, 19.5–24 Pleistocene
14-5, 25–27 Pleistocene
14-5, 27–30.5** Pleistocene
14-5, 30.5–32.5** Pleistocene
14-5, 32.5–43.5** Pleistocene
14-5, 86.7–113.7 Pleistocene
14-5, 122.5–123 Pleistocene
14-6, 9.5–25 Pleistocene
14-6, 30–33.5 Pleistocene
14-6, 36–36.3 Pleistocene
14-6, 58.9–68.5 Pleistocene
14-6, 72.7 Pleistocene
14-6, 93.5–95.2 Pliocene
18-1, 74(78)–91(97) Pliocene
18-1, 98 Pliocene
18-2, 116.5–117.2 Pliocene
18-2, 128.8–130 Pliocene
18-2, 137.8–138.5 Pliocene
18-3, 1.2†† Pliocene
18-3, 124–125 Pliocene
18-3, 125–131.5 Pliocene
18-3, 131.5–135 Pliocene

Notes: Type 2 ash layers contain >20% and 60% biogenic material. Type 3 ash layers contain >60% biogenic material. * = pod, † = borderline (15%–20% biogenic material), ‡ = discontinuous, ** = clay (too fine grained to determine biogenic/volcanogenic components, †† =lens. Inclined layers have values in parentheses representing the centimeters to the lower depth of the contact.