clay

UKAFH visit to King’s Dyke Nature Reserve, Sunday 19th August

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20180819_131316On 19th August UKAFH visited King’s Dyke Nature Reserve at Whittlesey near Peterborough.  This highly productive, family-friendly location is always a popular hunt and places quickly filled up so we had a full house of 35 with leaders Aidan Philpott and Sam Caethoven.

The geology of the location consists the Peterborough Member of the Oxford Clay Formation, representing the middle Jurassic period of circa 180 million years ago.  The clay is quarried for brick making but a spoil heap is provided in a designated area for fossil hunting and it was to this area we were destined today.

We were fortunate to enjoy warm but overcast weather, making hunting comfortable and dry. We kitted up we headed down to the dedicated fossil-hunting area where Aidan gave the group an introduction to the fossils that can be found.  The commonest finds are ammonites (especially Kosmoceras), belemnites (especially Hibolithes) and gryphaea, an oyster often called “Devil’s toenail” because of their curled, scaly appearance. However marine reptiles have also been commonly found in the quarry as well as teeth and bones from fish including the ray-finned Leedsichthys, probably the largest fish ever to have lived. An abundance of bivalves and brachiopods can also be found.

The location has an enormous quantity of fossils available and they are very easy to find, making it equally perfect for beginners who want to take home a treasure or two and for old hands who want to find something special, be it a bone, fish remains or a particularly large, complete or well-preserved specimen. The clay is easy to dig into and split so it is never a question of finding fossils; rather of narrowing down the large volume of finds into “keepers”. Soon we had good finds turning up, including calcite Kosmoceras ammonites, plenty of belemnite sections and an abundance of gryphaea.

Although on this occasion no-one was fortunate enough to find any reptile bone,  a Hybodus sp. shark tooth was found by Silas Shaul – the first I’ve personally encountered from this site. Well done Silas! Some sharp-eyed hunters like Billy Currie found small fish scales, bones and vertebrae and Tracey Herod found a beautifully preserved calcite-filled gastropod with its aragonite shell still in place.

As events drew to a close we received many kind remarks from attendees who commented on how they had enjoyed their day and were pleased with their finds.  We always love to hear your comments and see pictures of your finds, whether from one of our hunts or your own forays so please do share your news on our website and facebook pages!  Also please do sign up to our mailing list or keep an eye out on our website for forthcoming 2019 hunts which will be published soon.

Sam Caethoven

Fossil Hunt at Barton on Sea, May 13th 2018

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On Sunday 13th May UKAFH met at Barton on Sea in Hampshire, a coastal village a few miles east of Bournemouth.

Before heading onto the beach, Chris Tait provided examples of likely finds and explained the area’s geology and paleoenvironment. The cliffs and slippages here comprise the Barton Beds, a series of clay and sandy clay that was deposited about 36 million years ago during the Eocene epoch in what was a warm shallow sea. The sea would have been further south during the Eocene epoch, similar in latitude to modern day Spain and so the climate considerably warmer. We were very fortunate to be provided an example of warm weather as the day was bathed in sunshine and temperatures pleasantly mild. The warm, shallow Eocene sea was a rich ecosystem and the clay provided a great medium to preserve the remains of creatures that lived there which means the area is incredibly fossiliferous. The area is noted for having over 600 named species of bivalve and gastropod and is also particularly abundant in shark teeth and fish remains.

We ventured down from the carpark to the beach which, in such fine weather, is very popular with tourists. We began by investigating the base of the clay slippages. Although ill advised to dig into the slippages, on the surface of the clay are many fossils already washed out.  These include a whole variety of shells, especially bivalves which can be particularly ornate. Everyone found a variety of different species of gastropod. The shells here can be quite fragile, so it is important to bring a box, preferably with some padding to protect the specimens.

Later in the afternoon, many of us stopped for lunch which was an ideal opportunity to sit on the shingle and rootle through the flint pebbles in search of shark teeth. Once we got our eye in, many great examples of shark teeth were found, predominantly of the Striatolamia genus and Sam Caethoven found the dental palate of a fish, one which would have had shell crushing teeth, ideal for feeding on the abundant gastropods an bivalves here.

Later in the day, Chris Tait led a small group up onto the slippages to get a better look at the geology. It is extremely important that care is taken when on the slippages and it is not advised this is attempted without a guide as it can be easy to become stuck in mud. Evidence of this danger was provided by a number of abandoned wellington boots!

Thank you to everyone who attended and a big thank you to Chris Tait and Sam Caethoven for leading the hunt. I hope you all had a great time!

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Left to Right: UKAFH leaders Sam Caethoven, Aidan Philpott, Chris Tait and Nicky Parslow.