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II.—Plant Fossils from the Rai Valley District, Marlborough.
The following collections were made by Messrs. H. W. Wellman and H. J. Harrington in 1946:—
B363 “East side Rai Saddle Hill Road (S15/505 grid reference 891380).”
B364 “Middle Branch Alfred Stream in bush, 3 chains below serpentine. (S15/506 grid reference 874346):”
The following stratigraphic table is based on Wellman (1952).
| Maitai Group | Feet. |
| Conglomerate, sandstone, limestone with marine fossils (Wairoa limestone) | 7,000 |
| Green and purple banded mudstone | 2,000 |
| Grey banded mudstone and sandstone | 7,000 |
| Limestone and calcareous sandstone | 2.000 |
| Te Anau Group | |
| Pillow lava, conglomerate and breccia | 5,000 |
| Red and green sandstone, mudstone with rare plant impression. (B363, 364) | 7,000 |
| Coarse sandstone, sandstone with fragments of black argillite, conglomerate, tuff and lava | 20,000 |
Marine fossils from the upper limestone of the Maitai Group (Wairoa Limestone are of lower Permian age (Fletcher and Hill, 1952). The plant impressions are thus Carboniferous or older.
The plant fossils are in fine grey sandstone, weathering to a light yellow-brown. They are numerous, small, usually amorphous fragments, but a few can be classified in divisions Specimen B363/7 has venation snirlr to members of the Pteropsida and B363/3 has a rachis that branches like members of this division. Two isolated ovoid flattened bodies may represent sporangia, or seeds but no internal detail is discernible B363/1 and B364 show striate stems which are of a form referable to many members of the Sphenopsida Judged by the know ranges of the Sphenopsida (middle Devonian-Recent) and Pteropsida
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(upper Devonian-Recent) (Seward, 1933) and the stratigraphic relation to the marine fossils, the plant fossils from the Te Anau Group are middle Devonian to Carboniferous in age.