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Clasts
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Matrix
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Cement
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Core
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Section
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Piece
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Oriented?
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Volume (%)
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Size range (min-max) (mm)
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Shape
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Composition
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Internal structure
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Alteration
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Sorting
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Volume (%)
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Grain size
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Composition
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Structure
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Alteration
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Volume (%)
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Comments
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| 20R | 1 | 6 | Y | 60 | 2-30 | A-sA | P |
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Y | pS | 40 | Fg | sap ± glass | Ve |
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P = basalt and glass; shear vein in matrix |
| 20R | 1 | 7 | Y | 60 | 2-30 | A-sA | P |
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Y | pS | 40 | Fg | sap ± glass | Ve |
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P =more basaltic than glassy clasts |
| 21R | 1 | 16 | Y | 80 | <1-5 | sA-sR | P |
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Y | wS | 20 | Fg | sap + white min. |
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Hyaloclastite |
| 21R | 1 | 17 | Y | 80 | <1-5 | sA-sR | P |
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Y | wS | 20 | Fg | sap + white min. |
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Hyaloclastite |
| 21R | 1 | 18 | Y | 80 | <1-5 | sA | P | Ve | Y | pS | 20 | Fg | sap + white min. |
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Concretionary alteration mineral replacing glass shards |
| 21R | 1 | 19 | Y | 90 | <1-5 |
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P |
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pS | 20 | Fg | sap ± glass |
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| 21R | 1 | 20 | Y | 90 | <1-5 | sA | P | Ve | Y | pS | 10 | Fg | sap ± glass |
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| 21R | 1 | 22 | Y | 60 | <10 | A | P |
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pS | 40 | Fg | sap ± glass |
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P = glassy shards, some lithic basalt clasts |
| 21R | 2 | 1 | Y | 80 | 1-10 | sR | P | Ve | Y | pS | 20 | Fg | sap + white min. |
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Note: Shape: A = angular, sA = subangular, R = rounded, sR = subrounded. Composition: M = monomictic, P = polymictic. Internal structure: Cr = crushing, Ve = veining, Fr = fracturing, Sh = shearing, Po = preferred orientation. Alteration: Y = yes, N = no. Sorting: wS = well sorted, mS = moderately sorted, pS = poorly sorted. Grain size: Cg = coarse grained (>5 mm), Mg = medium grained (1-5 mm), Fg = fine grained (<1 mm). Composition: M = monomictic, P = polymictic. Only a portion of this table appears here. The complete table is available in ASCII.