The lake formed behind the terminal moraine of a substage of that glacier. The lower substage (Clevedonian) is well displayed near Clevedon in Somerset. Then the climate cooled again and the Valders substage began. Alex passed increasingly difficult tests measuring whether humans have achieved Piaget's Substage 6 object permanence. Upper Kazanian substage, Capitanian Stage, Middle Zechstein Epoch, Late Middle Permian. It was deposited 318-317 million years ago during the Kinderscoutian substage of the Bashkirian stage. The Cary substage dates to around 30,000 years before present. Egg release is common in substage 3b, as are fecal coils. It was rebuilt in 1907 and still retains its original substage machinery. In Russian stratigraphy, it originally formed a substage of the Artinskian stage. The following regression (Co1, at 87,0 Ma) separates the Middle from the Upper Coniacian substage. To be more specific, the people's democratic regime is a substage in capitalist development.