TheIn the distant past this area was under a warm shallow ocean. It advanced and retreated several times until finally, millions of years ago, it retreated never to return and leaving us with what geologists call the Paris Basin. Some of the Paris Basin is still under water - for instance the English Channel (aka la Manche). Other parts, such as south-east England and northern and central France are now high and dry.
coral sponges in our garden are easily recognisable.
The soil here is chalky and the rocks limestone because of this marine legacy. The sea left behind the