Proboscideans are a group of mammals that include mammoths, mastodons and elephants. The Woolly mammoth was first recorded in Eurasioan deposits of the second to last Ice Age, approximately 150,000 years ago. A full grown Woolly mammoth stood around 10-12 feet high at the shoulder and weighed in at 6-8 tons. Wear this unique pendant made of fossilized mammoth and be ready to describe the beast behind this piece. Ivory Jacks. Open Circle Fossilized Mammoth Necklace. 14K Gold Chain. Length: 18" Pendant Lenght: 1 1/4"