‘The Nature of Cambridge’ published

    This new book, written by volunteers from the Cambridge Natural History Society, has now been published (October 2022). Cambridgeshire Geological Society was pleased to be asked to contribute the chapter on the geology and landscape of the city, as a background to...
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Two new LGS

Two new LGS   In October 2022, two new sites were designated as Local Geological Sites. The first, Fowlmere Springs LGS, contains the most extensive collection of chalk springs in the county – the RSPB nature reserve of Fowlmere. The site is famous for its...
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Orwell Clunch Pit now a LGS

Orwell Clunch Pit now a LGS   Orwell Clunch Pit was designated a Local Geological Site in October 2021. The pit is also an SSSI for its chalk grassland flora. It is owned and managed by the Parish Council and is an attractive local ‘greenspace’ with...
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Two new LGS at Burwell

Two new Local Geological Sites designated at Burwell We are very pleased to announce that our latest proposal for designation as  Local Geological Sites (LGS) were recently (October 2020) approved by the County Wildlife and Geological Sites Panel. The two sites, 400m...
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The sea in the Fens

The Fens have been inundated by the sea on various occasions as shown by the marine silts and clays that can be found over large areas, even in the southern fenland of Cambridgeshire. The complex history of freshwater marshes changing to salt marshes and back again,...
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New Local Geological Site: The Great Fen

New Local Geological Site The Great Fen: Holme Fen and Whittlesea Mere LGS We are very pleased to announce that our latest proposal for designation as a Local Geological Site (LGS) was recently (Feb 2020) approved by the County Wildlife and Geological Sites Panel. The...
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Ice Age display, Sedgwick Museum

A superb mammoth tusk is now part of the Sedgwick Museum’s new Ice Age display. Sir John Franklin’s ill-fated expedition to the North-West Passage has often been in the news ever since he left England on the 19th May, 1845 never to return. Successive searches...
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Protecting the landscape heritage of the fens

The fenland has always been a land of mystery. This is particularly true when trying to unravel the complex history of dynamic changes in the landscape, which are directly linked to both sea level and climate. Thanks to an increase in research in recent years, much...
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Lime kilns at Isleham

Built around 1860, these listed buildings are the remains of a thriving clunch quarrying industry in this Fen Edge village. Three of the kilns are preserved, with the fire hearths visible inside. The clunch rubble was loaded in through the circular openings at the top...
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The economic geology of Burwell

Download our leaflet on the Aspects of Geological Interest in Burwell. Burwell is a “Fen Edge” village which lies to the North East of Cambridge. It has a long history, some of which was dependent on the geology of the underlying rock. It has evidence of...
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Promoting interest in the geology of Cambridgeshire, the UK and worldwide

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We have a programme of 10 Monthly talks running from September to June each year, held on the second Monday of every month. All talks (unless specified otherwise) are at 7.30 pm (doors open 7.00 pm). Everyone welcome, free to CGS members, £3 for non members. From September 2022 onwards these will be held in the hall at St Andrew’s Church, Histon.


Monday 12th December 2022 (7.00 for) 7.30pm

Paleoclimateology from Snowball Earth to Anthropocene

Dr Colin Summerhayes, Scott Polar Institute

This explains how greenhouse gases and temperatures varied through time, giving us alternating periods of warm ‘greenhouse’ climate and cold ‘icehouse’ climate over the past 800 million years. It explains how it is that Antarctica was once covered by subtropical forests, and why ice sheets did not cover it until 34 million years ago. It also explains the origins of the global Ice Age of the past 2.6 million years, explores the roles of the Sun and of the Earth’s orbit in controlling past climate change, and provides a past natural analog for today’s unnatural global warming. The past is the key to understanding the future..

New Walk Guide published on the Fen Edge Trail

Cambridge: Castle Hill to the Sedgwick Museum

Known for its location on the River Cam and its nearby Chalk hills, Cambridge is still very much a fen edge city. Arriving in Cambridge from the north, along the River Cam, the Trail reaches the distinctive landscape feature of Castle Hill, the site of an early, and highly strategic, settlement that developed to become one of the world’s most iconic cities. This walk takes you down from the hill and across the ancient Magdalene Bridge, before winding along the river valley, past several colleges and providing quintessential views of the ‘Backs’. After passing through the characteristic ‘fens’ that still survive along the Cam, it finishes at the internationally important Sedgwick Museum of Earth Sciences. Guiding you through what is now a mostly hidden landscape, the walk takes you back in time, giving a glimpse into the city’s past and the natural history of the area, from ‘Ice Ages’ to sub-tropical swamps and fenland rivers. You will discover how its natural character still filters through, seen in the riverside meadows, the numerous water channels, the subtle changes in the height of the land and even in the building stones used in many of its famous buildings.

Previous Events


Field Trip Report – Burwell Local Geological Sites

The society organises occasional field trips to view important geological sites within the county and hopefully further afield in post pandemic times. These trips are primarily for our members.

In early summer 2021 we had a popular visit to the Burwell Local Geological Sites and are scheduling some others to East Pit, Cherry Hinton, a walk along the Fen Edge from Swaffham Bulbeck to Reach, a visit to Nine Wells chalk spring and a tour of the building stones of Cambridge city center. These are primarily for the benefit of members: any member wishing to participate should contact us.

A write up for this trip may be found here.



Our October 2022 newsletter is now available to members.

Our previous newsletters are available to everyone (download below). They have plenty of ideas for some virtual geology!

CGS Newsletter Dec 2021

CGS Newsletter August 21

CGS Newsletter April 2021

CGS Newsletter December 2020

CGS Newsletter July 2020

CGS Newsletter April 2020

Email updates

Sign up for our email updates to hear about future talks, events and news of our projects.

Contact us



Cambridgeshire Landscapes

Cambridgeshire has a fascinating landscape and an interesting geology. See our Landscapes page for more details and download the excellent leaflet ‘The Mapping of Landscapes, Geology and Soils of Bedfordshire and Cambridgeshire’ by Timothy Farewell, Peter Friend, Martin Whiteley and Joanna Zawadzk.


Our talks and other events

meet us

Local sites

Chalk cliff East Pit



Hippopotamous, Sedgwick useum


Local landscapes

The Fens




The Fen Edge Trail

Landscape Heritage

Mare Fen, Swavesey



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