concretionのTwitterイラスト検索結果。 6 件
Bandringa was an ancient shark-relative found in the Mazon Creek concretions. The dominance of youngsters and egg cases suggest the area served as a nursery. What's more, arthropod remains are found in their stomachs.
https://t.co/OSHj0OEoF4
#ChondrichthyesWeek #FossilFriday
Natural sandblasting has hollowed out the softer sandstone and left the resistant bands of ironstone standing to give a Swiss cheese effect to this block in an old sandstone wall.
#ironstone #concretion #sandstone #naturejournaling
https://t.co/AtKYcV5cTg
#LagerstatteoftheWeek Juveniles of the ancient shark-relative, Bandringa, are found in the Mazon Creek concretions. The lack of adults and dominance of youngsters and egg cases suggest the area served as a nursery.
https://t.co/nBCnjya325
#fossils
Ichthyosaur bones can create patterns of ridges in the shale, even if bones can’t be seen. Other fossils & mineral concretions can form bumps too. Pic shows the bones in section - half an ichthyosaur bone looks like a black bow tie. 6/9
Ichthyosaur bones can create patterns of ridges in the shale, even if bones can’t be seen. Other fossils & mineral concretions can form bumps too. Pic shows the bones in section - half an ichthyosaur bone looks like a black bow tie. 6/9
