A four layer model of southwestern Ontario's Paleozoic bedrocks by geological age. Each layer is removable. The featured layers are Devonian (green), Silurian (yellow), Ordovician (blue), and Precambrian (red). The cities of London and Toronto are marked. This model is printed at 1 to 2.5 million scale and measures approximately 24 cm x 16 cm x 10.5 cm (LxWxH). Great for any geologist!