| The radiometric age data combined with the petrography of the volcanics thus indicate two separate events of volcanism in the Danish North Sea. |
| These are overlain by low-grade metamorphosed sediments and volcanics of Ordovician and Silurian age. |
| The Old Red Sandstone and the contemporary volcanics and marine sediments found in Devon originated from these processes. |
| Individual samples weighing 24 kg were collected from the Dal and Bandak volcanics and were crushed and milled. |
| In this study we concentrate on the field relations and stratigraphy of the pyroclastic deposits within the lower volcanics. |
| The wide distribution of the volcanics implies that a mantle plume was present beneath northern Australia in the past. |
