Fig. 3
From: VOLCORE, a global database of visible tephra layers sampled by ocean drilling

Pie chart showing the total number of tephra occurrences during geological time periods. The Quaternary dominates the VOLCORE record.
From: VOLCORE, a global database of visible tephra layers sampled by ocean drilling

Pie chart showing the total number of tephra occurrences during geological time periods. The Quaternary dominates the VOLCORE record.