Feathered dinosaur the deciduous sheath, forming a tuft of unbranched barbs with a basal calamus. Stage III consists of two developmental novelties, IIIa and IIIb, as either could have occurred first. Stage IIIa involves helical displacement of barb ridges arising within the collar. The barb ridges on the anterior midline of the follicle fuse together, forming the rachis. The creation of a posterior barb locus follows, giving an indeterminate number of barbs. This resulted in a feather with a symmetrical, primarily branched structure with a rachis and unbranched barbs. In stage IIIb, barbules paired within the peripheral barbule plates of the barb
Calamus-Wheatland 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 of approximately 120 students in grades nine through 12. Located approximately one mile north of U.S. Highway 30 in Wheatland, Calamus-Wheatland High School draws students from several communities in western and southwestern Clinton County, including Calamus, Wheatland and Toronto; the district also includes a small portion of northwestern Scott County, drawing students from Big Rock and rural areas north and west of Dixon. Calamus-Wheatland came into being in 1986,