🦕🪨⏳

#fossils #geological time scale #stratigraphy #earth history #sedimentary geology

🦕🦴🪰⏳

#fossils #stratigraphy #geological time scale #earth history #sedimentary rocks #deep time

🦴🦕⬇️⏳

#biostratigraphy #fossils #superposition #relative dating #geological time scale #index fossils

🦕🧄⏳

#strata #sedimentary rock #deep time #geological time scale

⏳🌍🪨

#cretaceous period #geological time scale #mesozoic era #chalk formation #stratigraphy #paleogeology #ancient earth

🕰️🪨💥🧬

#cambrian explosion #origin of phyla #geological time scale #life history #biodiversity burst

🗓️⛰️🌊

#paleozoic #geological time scale #strata #ancient ocean #ediacaran