User:Abyssal/Prehistory of Europe/DYK/16
![An illustration of a fossil horn coral by William Martin](http://upload.wikimedia.org/wikipedia/commons/thumb/5/54/Coalball.jpg/100px-Coalball.jpg)
- ... that coal balls are not made of coal?
- ... that both Fordilla and Pojetaia, Cambrian members of the extinct bivalve family Fordillidae, are part of the Turkish small shelly fauna?
- ... that modern humans have been found to inhabit various countries for periods ranging from almost 200,000 years to less than 800 years?
- ... that the stems in the pseudo-trunk of the extinct fern Tempskya decayed as the plant matured, leaving a layer of adventitious roots behind?
- ... that the fossil ant genus Yantaromyrmex (pictured) is found in four amber deposits in Europe?
![An illustration of a fossil of Prodryas persephone](http://upload.wikimedia.org/wikipedia/commons/thumb/f/f7/Yantaromyrmex_geinitzi_MBI2290_02.jpg/100px-Yantaromyrmex_geinitzi_MBI2290_02.jpg)
- ... that the fossil ant genus Yantaromyrmex (pictured) is found in four amber deposits in Europe?
- ... that the fordilloid Camya asy is one of four accepted Cambrian bivalves?
- ... that archaeologist Harold St George Gray discovered that the 11 m (36 ft) deep ditch surrounding Avebury was dug from solid chalk using red deer antlers as picks?
- ...that several prehistoric standing stones and natural stone features in Scotland are called Carlin stones, possibly from the term cailleach meaning "old hag" or "witch"?
- ... that an extension of Ferrybridge Henge in West Yorkshire was discovered when surveying an area in preparation to erect a row of houses?