Mill Glen
Also within
Condition (NatureScot)
| Unit | Feature | Condition | Area (ha) | Assessed |
|---|---|---|---|---|
| F1 | Old Red Sandstone Igneous | Unfavourable Declining | — | 2024-03-25 |
Geology & landscape
Geological Period: Devonian
Landscape processes: Fluvial
Description
Mill Glen Mill Glen Site of Special Scientific Interest lies to the north of Tillicoultry on the south side of the Ochil Hills on the escarpment overlooking Clackmannanshire. The exposed rocks in the crags within the four sections of the site are important for illustrating the character of the small diorite stocks which intrude and contact metamorphose the lavas and tuffs of Lower Devonian age along the line of the Ochil Fault. The diorites are notable for their locally heterogeneous and hybrid character. These features are especially well seen in the deeply-incised Harviestoun Glen where a number of poorly-defined enclaves of hornfels are apparently disposed in layers and show hybridised margins.