| Orthoclase occurred as remnant phenocrysts in a groundmass of chloritic material resulting from alteration of iron-rich felsite cobbles. |
| The microgranite has a felsitic groundmass containing microphenocrysts of albite and orthoclase along with phenocrysts of corroded quartz and sporadic dihedral garnet. |
| The felted or hyalopilitic texture is the most common, and plagioclase is the principal groundmass constituent. |
| The maximum length of most microbes in Group II could not be measured accurately because they are tightly embedded in the silica groundmass. |
| The groundmass consists mainly of bytownite with large grains of diopside and of colourless olivine, and small octahedrons of magnetite. |
| In all specimens the groundmass is peppered with opaque minerals, rare apatite laths and rare euhedral blade-like calcite. |
