#bathonian

“Figure 6: Mesial and lateral teeth of R. sakalavae.

(A) replacement tooth pm1 in MHNT.PAL.2012.6.2; (B) mesial functional tooth MSNM V5775; (C) pm4 in MHNT.PAL.2012.6.2; (D) lateral tooth of indeterminate position MSNM V5773. Scale bars = 10 mm. Abbreviations: see text.”

I just had to post this because of how beautiful these teeth are.

bivalves insitu from the Frome Clay

Cliffs at Cogden Beach, Dorset

Cliff End East, Dorset

Cogden Beach, Dorset

Fossil collecting at Cogden Beach, Dorset

Frome Clay exposed at Cogden Beach, Dorset

Cogden Beach, Dorset

DIRECTIONS

♦ The beach can be accessed from the National Trust car park at Cogden. From here, a short walk descends to the wonderful sandy beach. Turn right (west) and the cliffs soon appear and continue to Hive Beach. ♦ Alternatively, park at the National Trust car park at Hive Beach and walk east to Cogden Beach. ♦ Postcode: DT6 4RL (Cogden), DT6 4RF (Hive Beach) ♦ Grid Ref: SY 49641 88581 ♦ Ref: SY 66016 77304

PROFILE INFO

FIND FREQUENCY: ♦♦♦ – Fossils in the Frome Clay are not common, although a few specimens should be found. CHILDREN: ♦♦♦♦♦ – This is an excellent site for children. Cogden Beach is a clean, sandy beach at the eastern end and there is a cafe with toilets at Hive Beach to the west. It also makes a wonderful family walk from Cogden car park to Hive Beach cafe and back along the coastal path. ACCESS: ♦♦♦♦♦ – Access is very easy, with nearby parking at Cogden or Hive Beach. TYPE: – Fossils are found in the clay cliffs and within loose slabs of rock at the eastern end of the section.

FOSSIL HUNTING

The Brachiopod Goniorhychia boueti is very common here

Fossil collecting requires some persistence at this site. At Cogden Beach, as the low cliffs appear, the Frome Clay reveals a white cementstone bed, which is fractured, with pieces loose on the beach. Some mudstones also appear at beach level and the cliff is somewhat degraded, due to landslip. Both the cementstone and mudstone reveal bivalves and small gastropods. However, the most common find are slabs of blue-grey oyster bed.

Bivalves exposed in the Frome Clay

Goniorhychia boueti

mudstone oysters

Myophorell clavellata

The cliff increases in height towards Hive Beach and is known as Cliff End. Here, the Boueti Bed is exposed in the irregular ground immediately inshore of the cliff edge. Weathered brachiopods occur on the surface and include Goniorhychia boueti, Avonthyris langonensis and Dictyothyris coarctata. The cliffs below, at beach level, may also contain these brachiopods, but it requires hard work to find them. The Boueti Bed defines the base of the Forest Marble Formation, which overlies the Frome Clay. More common are serpulid tubes and bivalves (particularly Gryphaea). Corals and echinoids are also present, but are rare.

GEOLOGY

The fossils are Jurassic (Bathonian) in age.

Blocks of White Cement Stone  within the Frome Clay, within the cliffs at Cogden Beach, Dorset

EQUIPMENT

You do not need any tools here. Fossils can be picked up loose from the beach and the clay cliff.

SAFETY

The site provides a safe and easy way to collect fossils. However, do not climb the cliff and be aware of incoming and rough tides, particularly during winter months.

ACCESS RIGHTS

This site is an SSSI and forms part of the UNESCO World Heritage Jurassic Coast. 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, download the PDF from Natural England. Confine any foreshore collecting to fallen blocks on the beach and especially the lag conglomerate deposits.

It is important to follow our ‘Code of Conduct’ when collecting fossils or visiting any site. Please also read our ‘Terms and Conditions‘

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LINKS

♦ Buy Fossils, Crystals, Tools ♦ Location Discussions ♦ Deposits Magazine ♦ Join Fossil Hunts ♦ UK Fossils Network

Craig Chapman. Last inspected 2016, Updated 2016, Edited by Jon Trevelyan 2016

Fossils from the Polish Bathonian clays

The Middle Jurassic Bathonian stage, which is preceded by Aalenian and Bajocian and overlaid by the Callovian, was established on the basis of oolitic limestones outcropping at Bath in Somerset. This historical and English connection is a major reason I have chosen the Bathonian as a topic for Deposits Magazine. The Bathonian clays in Poland, like the English classic Kimmeridge Clay or Callovian…