Sinornithosaurus form from those found on birds from the same geological deposits. The body (contour) feathers were generally between 3-4.5 cm long and included two types: the first type are formed of several filaments joined together into "tufts", similar to modern down feathers. The second type, including those on the arms, were composed of rows of filaments ("barbs") joined together along a main shaft ("rachis"), making them similar in structure to modern bird feathers. However, unlike the wing feathers of flying birds, they did not have the secondary branches with tiny little hooks ("barbules") that flight feathers have, which allow the
Calamus-Wheatland High School 1A school (Iowa's smallest schools enrollment tier), according to the Iowa High School Athletic Association and Iowa Girls High School Athletic Union. The school is a member of the thirteen-team Tri-Rivers Conference, which comprises schools from rural communities in Clinton, Jackson, Jones, Buchanan, Delaware, and Linn counties. The men's varsity basketball team finished second in the 2010 state basketball tournament, falling to the Siouxland Conference's Rock Valley High School. Calamus-Wheatland High School Calamus Wheatland High School is a four-year comprehensive high school located in Wheatland, Iowa. The school is part of the Calamus-Wheatland Community School District, and has an enrollment