The evening started from the Medieval Thornborough Bridge (pictured above) constructed from the local Blisworth Limestone which we were to see in the quarry. The route took us under the busy A421 upstream along the bank of the Padbury Brook (a few members took advantage of much nearer car parking courtesy of the local farmer so missed the walk but had time to set out the demonstration table above the quarry).

The Padbury Brook was a green corridor of reeds and rushes through the parched meadows. Late flowering summer flowers on its banks were still showing well including Great Willow Herb, Marsh Woundwort, Water Forgetmenot, Water Figwort, Angelica and Teasel.

Two Brown Hares on an arable field opposite offered early excitement. Unfortunately there were few insects in evidence and birds were few and far between but did include Grey Wagtail, Reed Bunting, Swallows, and a large flock of Rooks feeding on stubble.

Joe gave a brief introduction to the rock exposure in the quarry as observed from the viewing platform above it. Mainly drawing on the excellent Bucks Geological Society website and Interpretation Boards he explained that deposition was about 170 million years ago in the Middle Jurassic Period. The area was then at a latitude of about 40 degrees North. He explained that the Blisworth Limestone was deposited in low energy shallow warm marine conditions (as currently found in the Florida Keys). The Blisworth Clay above the limestone was deposited in lagoonal, mud flat and brackish marsh environments. There are fewer fossils but a dinosaur(Theropod) footprint had been found near-by at Thornborough Mill.

Of particular interest was a fault line (subsequent to deposition) which had displaced the younger rubbly Cornbrash seen to the east of the quarry downwards relative to the Blisworth Limestone. This could be clearly seen despite slumping of much later material.

Jenny then demonstrated how this had happened with a specially baked ‘strata’ cake! (Subsequently the cake was rapidly eroded by participants!)

Most of the group then spent about an hour examining the structural features of the quarry and some Blisworth Limestone samples. We noted that the latter are made up of accumulated fossil shell fragments bound together with a carbonate cement. The fossils that can be found here are of Bivalves, Gastropods, Corals, Ecinoids and Brachiopods. Members identified with some confidence Bivalves and Gastropods including a small number with complete shells. A worm like trace fossil was also found. Others proved more challenging to identify. Calcite crystals (precipitated after deposition) were also in evidence especially with the aid of hand lens.
During the time in the quarry area several members explored the wooded area adjacent to it: a Jay and Tree Creeper were seen and a Green Woodpecker heard. Some also found the ruins of the two 19thcentury lime kilns which operated on the site until 1890 and are now marked by an information board.
This outing was rather different from our normal living wildlife focus but apart from its attractive setting the geology observed was a useful reminder of a past habitat and some of the animals that lived in it.
Text by Jenny Mercer and Joe Clinch
Pictures by Peter Hassett



Early return to breeding areas is widely acknowledged to be ‘a good thing’ but why? Some people suggest that early migrants can choose the best territories, others argue that early chicks have a disproportionately high chance of fledging but there are other explanations too. In their paper in Ecology & Evolution, Catriona Morrison and her colleagues ask how much of the advantage of being an early migrant could be associated with having an option to nest again, if the first attempt fails.










































For Northamptonshire’s butterflies 2018 has been a memorable year for many reasons. Not only did we have two national projects in the county but it was also an exceptional season for many of our butterflies. When I first became interested in the serious study of butterflies I’d often hear stories of huge groundings of Purple Hairstreaks, explosive Black Hairstreak years and numerous rare aberrations and colour forms which at the time such spectacles seemed to be confined to the history books so to witness many of these events first hand in 2018 made the year an extraordinary one to say the least.




















The Buckinghamshire Bird Club have published a very interesting article on theSpotted Crake at Willen Lake



















We have been colour ringing black-tailed godwits at the Nene and Ouse Washes to help us understand more about the birds’ movements in the breeding and non-breeding season. Godwits are known to undertake long and often complex migratory journeys, and the marking of individual birds provides valuable information about the remarkable journeys these birds undertake.

Over the past few years I’ve posted several pieces about how colleagues, students and myself have been monitoring one aspect of the environmental impact of the University of Northampton’…































Sadly, the area is under threat from development of adjoining land which will inevitably lead to increased disturbance to all of the wildlife that makes the site its home. Helping to create a successful breeding colony of sand martins will not only benefit the birds and the overall biodiversity of the site, but it will help to secure this important site’s position as the premier nature reserve in Milton Keynes and protect it from further damage from human activity.











Weather wise 2017 proved to be a mixed bag and started with a nice spring which caused many butterflies to emerge early, in fact some of the spring butterfly species emerged two weeks earlier than they had the year before. Unfortunately despite the year being one of the warmest on record the weather took a serious turn for the worst during late June when high winds hit the county and then unsettled conditions dominated as the storms battering the USA made their way across the Atlantic to us.














The Daily Telegraph travel section has published an article “Inside Britain’s magnificent Tree Cathedral – and five more arboreal structures” featuring the Tree Cathedral at Willen



The Field Studies Council has compiled a catalogue of over 630 biological identification resources













































