Ephemeral Marks in river-margin substratum produced by the akene of the Spiny cocklebur (Xanthium spinosum): possible trace fossil implications. Geo-Eco-Marina [Internet]. 2021 Dec. 31 [cited 2026 Jun. 29];27:99-103. Available from: https://journal.geoecomar.ro/geo-eco-marina/article/view/06_2021