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Section Contents
- Introduction
- Geological History
- The Hawse
- Palaeomagnetism
- Sediment rafts
- Vesicles
- Hutton's Section
- Spheroidal weathering
- White sandstone
- Hutton's Rock
- Distorted strata
- Contact details
- Crag and Tail
- The Cats Nick
- Dykes
- Slickensides
- Dessication cracks
- Ripple marks
- Bedding
- The Long Row
- Vent Agglomerate
- Sampsons Ribs
- Geological Map
- Questions
- References
Extras
Tutors only
Core samples for palaeomagnetic analysis
Locality 2: The Salisbury Crags sill is made from an igneous rock called dolerite, injected as a hot liquid magma about 300 million years ago. As the magma cooled and crystallised it had frozen into it a record of the direction of the Earth's magnetic field at that time. Oriented core samples of the rock are taken to measure the remnant magnetic field direction. So what can be deduced from such measurements?