#Septarian concretions are concretions containing angular cavities or cracks, called "septaria". The septaria are the calcite-filled cracks at the center of the rock, indicating where the centers of the concretions have shrunk Read more here:
https://www.geologyin.com/2017/12/what-is-septarian-concretion.html?fbclid=IwZXh0bgNhZW0CMTEAAR0ImyrBameF-2InXzxkWBWCDC747YUD_RuzJ1C7D_bukv5o8UUt38YYrc8_aem_Ab4t_iSdZ939KChtdSA-GID58WmaWrmB3aBLHjDbxisfQgrJ7k6DUIQDqnh832Ku94q5Dv3uLJjMyHSbDC8y2EZV
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