Ediacaran periglacial sedimentary structures
DOI:
https://doi.org/10.54991/jop.2021.8Keywords:
Kimberichnus, Epibaion, Periglacial, Vagrant lichens, Frost boils, Needle iceAbstract
Ediacaran fossils are sometimes reconstructed as colorful organisms of clear azure seas like tropical lagoons, or as ghostlike forms in deep, dark oceans. Alternatively, they can be envisaged as sessile organisms in frigid soils, to judge from associated Ediacaran periglacial paleosols and tillites. Additional evidence of cool Ediacaran paleoclimate now comes from reinterpretation of two supposed trace fossils: (1) grooves radiating from Ediacaran fossils interpreted as radular feeding traces (“Kimberichnus”) of supposed molluscs (Kimberella), and (2) chains of fossil impressions interpreted as feeding traces (“Epibaion”) of supposed worms or placozoans (Yorgia, Dickinsonia). The grooves are not curved with rounded ends like radular scratches, but with sharp or crudely bifid tips like frost flowers and frost needles extruded from plant debris. Fossil impressions in chains are not sequential feeding stations, but in polygonal arrays, like vagrant lichens and mosses displaced by wind gusts and periglacial frost boils. Thus, neither the taphomorph “Epibaion”, nor the ice crystal pseudomorphs “Kimberichnus” are valid ichnogenera. These newly recognized frost boils, needle ice, frost feathers, frost hair and frost shawls are additions to isotopic and glendonite evidence that the Ediacaran was another period in Earth history when even low paleolatitudes were cool.
सारांश
एडियाकारन जीवाश्मों को कभी-कभी उष्णकटिबंधीय लैगून जैसे, स्पष्ट नीले समुद्र के रंगीन जीवों के रूप में या गहरे, अंधेरे महासागरों में भयंकर बनावट के रूपों में पुनर्निर्मित किया जाता है। वैकल्पिक रूप से, उन्हें संबंधित एडियाकारन पेरिग्लेशियल, पुरामृदा और टिलाइट्स से निर्धारण करने के लिए, मिट्टी में अव्रिंत जीवों के रूप में परिकल्पित किया जा सकता है। ठंडे एडियाकारन पुराजलवायु के अतिरिक्त प्रमाण अब दो कथित ट्रेस जीवाश्मों की पुनर्व्याख्या से आते हैं: (1) एडियाकारन जीवाश्मों से निकलने वाले खांचे, जिन्हें कथित मोलस्क (किम्बरेला ) के रेडुलर फीडिंग ट्रेसेज ("किम्बेरिक्नस ") के रूप में व्याख्या की गई है। (2) जीवाश्म मुद्राश्म की श्रृंखला की कथित कृमियों या प्लाकोज़ोन्स (योर्गिया, डिकिन्सोनिया ) के भक्षण निशान ("एपिबैओन ") के रूप में व्याख्या की गई । खांचे रेडुलर खरोंच की तरह गोल सिरों के साथ घुमावदार नहीं होते हैं, लेकिन पौधे के मलबे से निकाले गए फ़्रोस्ट फ्लावर्स और फ़्रोस्ट नीडल की तरह तेज या कुटिल रूप से द्विभाजित युक्तियों के साथ होते हैं। जंजीरों में जीवाश्म मुद्राश्म अनुक्रमिक फीडिंग स्टेशन नहीं हैं, बल्कि बहुभुज सारणियों में हैं, जैसे हवा के झोंकों और पेरीग्लेशियल फ्रॉस्ट बर्फीले बौइल्स द्वारा विस्थापित स्वेछाचारी लाइकेन और मॉसैज़। अत: न तो दबी हुई संरचना "एपिबैओन ", और न ही बर्फ के माणभ सूडोमोर्फ "किम्बेरिक्नस " वैध इकनोजाति हैं। ये नए पहचाने गए नीडल आइस, फ्रॉस्ट हेयर और फ्रॉस्ट शौल समस्थानिक और ग्लेंडोनाइट साक्ष्य में संयोजन हैं कि एडियाकरन पृथ्वी के इतिहास में एक और अवधि थी जब यहां तक कि निचले पुराआक्षांश भी ठंडे थे।
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