Natural History & Ecology: Mature striped dolphins may range in length from 180 cm to 256 cm and 110 to 160 kg in weight. Average length at sexual maturity has been found to be 195 to 220 cm for both males and females of the species at an age of 9 to 10 years old.
Bog iron is a type of iron ore composed of mostly mineral goethite and other iron-bearing minerals with impurities like clay or plant debris. Bog iron used to be a very important ore of iron before better alternatives like banded iron formations were discovered.
Bog iron may in many cases be quite rich in iron. The main problem is that bog iron forms only a thin layer of rust-colored and porous layer at the bottom of bogs. It simply is not economical to search for such thin and laterally widespread deposits.