Before revision: Euxinic deep water is a key component of the Canfield ocean, a model of oceans during the Proterozoic period ( known as the Boring Billion) proposed by Donald Canfield, an American geologist, in 1998.
After revision: part ofa part specificallyEuxinic deep water is a key component of the Canfield ocean, a model of oceans during the Proterozoic period ( known as the Boring Billion) proposed by Donald Canfield, an American geologist, in 1998.