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Trigonia – Jurassic
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Quiastolita - China
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Puntas de flecha de Silex del Neolítico Azurita Trigonia – JurassicSpecies Heliophora Orbicularis Geological Period Pliocene 5. 3 1. 8 ma Origin Western Sahara , Mauritania Size 3. 0 4. 0cm Hedgehog Heliophora Orbicularis of good keeping quality, also known as "Sand Dollar". This irregular sea urchin has a very distinctive appearance from the others, with a carapace that is from orbicular oval in shape and with finger shaped teeth that can be limited to the rear edge of the animal or found around its entire
