| IGSN | Sample Type | Notes | Location | Number Thin Sections | Storage Location |
|---|---|---|---|---|---|
| GRD00EKS0 | Layering | Contact between granite and gabbro | 0 | Ritter 154, 15 R | |
| GRD00EKS1 | Layering | Smaller sample of the contact between granite and gabbro | 0 | Ritter 154, 15 R | |
| GRD03Z9S0 | Layering | Large boulder sized sample of obsidian and pumaceous material, flow banded | California | 0 | Ritter 154, 16 I |
| GRD03ZAS0 | Layering | Obsidian and pumaceous material, flow banded | California | 0 | Ritter 154, 16 I |