Poxwell Quarries are a couple of old, very overgrown quarries, but a small outcrop in the second quarry still reveals the productive Purbeck beds that contain well-documented insect remains. You can also find fishes, ostracods and small shells. However, you will need a microscope for viewing your finds.
♦ From the A352, take the A353 to Poxwell. You will pass through the hamlet and, on a bend in the road, you will see an old quarry on the left hand side with a grassy area on which to park. Poxwell is shown on 1:25,000 scale maps, but is referred to as ‘Poxwell Manor’ in 1:50,000 scale maps. The disused quarry has a mobile phone mask and warning sign.
♦ Park on the grassy area, where you can examine the Purbeck beds, although they are not as productive as those in the second quarry.
♦ From this quarry, cross the road and walk south. The second quarry is a very short walk away. You will see a signpost with ‘Public footpathâ€™, which heads through a gate, then a farm and uphill. Take this footpath.
♦ Walk up the hill. Be careful, as you can easily miss the old quarry as it is very overgrown. However, the productive bed is still accessible. On the left hand side, you will notice the ground dips suddenly all the way up the hill. This is the relevant quarry.
♦ Ref: 50.65070°N, 2.37004°W
FIND FREQUENCY: ♦♦♦♦ – Providing you collect samples from the right beds, this location is very productive and full of microfossils.
CHILDREN: ♦♦ – Locations for microfossils are generally not recommend for children who want to find fossils, as the finds will be made back at home or in the lab once you process your samples. This is not particularly exciting for young children.
ACCESS: ♦♦ – Poxwell Quarries can be difficult to find. However, if you have a 1:25,000 scale map, the quarries are marked.
TYPE: – The productive beds are in an old, disused and very overgrown quarry.
This is a SSSI, so do not over collect. Take only a few samples from the scree. Microfossils are found within the white chalky layer of micrites and some within the harder layer directly above this layer. You will know when you have the correct layer, as it feels like soft chalk and will rub off easily on your hands. It is in the middle beds of the small outcrop, about 140cm above the ground.
The best way to process your samples is to break them down with dilute acetic acid (for example, white vinegar). This will separate the fossils. If this is not possible, then the material is actually quite soft and small pieces can easily be crumbled in your hands. This method may cause some fossils to become damaged.
Larger lumps can be broken down into smaller pieces using a small hammer. Once you have broken up the sample, use water to wash the sediments and remove any sand, ideally by using a sieve. Then wet sieve the samples at 500, 200, and 150 microns. Sieves and microscopes can be purchased from UKGE Ltd.
Microfossils from Poxwell Quarries are abundant. In particular, this location is well known for its insect and fish remains, including small fragments of beetles. Ostracods and small shells are also very common here. You can just make out the tiny black/brown remains in the material, but you will need a microscope to view these properly.
The Purbeck Beds at Poxwell are from the Lulworth Formation. The fossils are found in the chalky white layer of micrites (small, calcareous particles) at the second quarry. This is Portlandian in age, from the Jurassic period, about 145myrs old.
Common sense when collecting at all locations should be taken. There are no real dangers at this location apart from care should be made at the first quarry, as the cliff face overhangs a lot. However the fossils are found at the second quarry, and this is so overgrown that cliff falls are not possible.
Fossils from Poxwell Quarries are microfossils, so you will need to take samples back home to process and then view under a microscope. A sieve is also recommended for processing samples on site.
This site is an SSSI. This means you can visit the site, but hammering the bedrock is not permitted. For full information about the reasons for the status of the site and restrictions please download the PDF from Natural England – SSSI Information – Poxwell Quarries