2016 y\u0131l\u0131nda jeolog Allan Krill, Grand Canyon Ulusal Park\u0131\u2019ndaki Bright Angel Trail\u2019\u0131 ke\u015ffederken ilgi \u00e7ekici bir ke\u015fif yapt\u0131. B\u00fcy\u00fck bir kumta\u015f\u0131 kaya blo\u011funa kaz\u0131nm\u0131\u015f, eski ayak izlerini and\u0131ran bir dizi \u00e7ukur fark etti. Bu izler fosille\u015fmi\u015f izler \u00e7\u0131kt\u0131 ve parkta \u015fimdiye kadar bulunan en eski omurgal\u0131 fosil izleri oldu.<\/p>\n\n
Ayak izlerini inceleyen paleontolog Stephen Rowland, ya\u015flar\u0131n\u0131 yakla\u015f\u0131k 313 milyon y\u0131l olarak tahmin etti. Bu ola\u011fan\u00fcst\u00fc bulgu, sadece erken omurgal\u0131lar\u0131n evrimine \u0131\u015f\u0131k tutmakla kalm\u0131yor, ayn\u0131 zamanda sert kabuklu yumurta d\u00f6ken hayvanlar olan amniyotlar\u0131n d\u00fcnyadaki en eski kan\u0131t\u0131n\u0131 da sa\u011fl\u0131yor.<\/p>\n\n
Y\u00fczlerce kilo a\u011f\u0131rl\u0131\u011f\u0131ndaki iz ta\u015f\u0131yan kaya blo\u011fu, yakla\u015f\u0131k 314 milyon y\u0131l \u00f6nce olu\u015fmu\u015f kumta\u015f\u0131 yata\u011f\u0131 olan Manakacha Formasyonu\u2019ndan kopup d\u00fc\u015fm\u00fc\u015ft\u00fc. \u0130zler, kumlu y\u00fczey \u0131slan\u0131p kuruyunca olu\u015fmu\u015f ve milyonlarca y\u0131l boyunca korunmu\u015ftu.<\/p>\n\n
Kayan\u0131n y\u00fczeyinde iki ayr\u0131 iz seti g\u00f6r\u00fcl\u00fcyor. Birinci set, hayvan\u0131n yava\u015f\u00e7a \u201cyanal s\u0131ral\u0131 y\u00fcr\u00fcy\u00fc\u015f\u201d ad\u0131 verilen, kararl\u0131l\u0131k i\u00e7in ayaklar\u0131 belli bir d\u00fczende hareket ettirdi\u011fi bir y\u00fcr\u00fcy\u00fc\u015fle ilerledi\u011fini g\u00f6steriyor. \u0130kinci iz seti ise biraz daha h\u0131zl\u0131 bir hareketin kan\u0131t\u0131.<\/p>\n\n
Ayak izlerinin incelenmesi, erken omurgal\u0131 hayvanlar\u0131n davran\u0131\u015flar\u0131na ve \u00e7evrelerine dair de\u011ferli bilgiler sa\u011flad\u0131. G\u00f6zlemlenen yanal s\u0131ral\u0131 y\u00fcr\u00fcy\u00fc\u015f, bug\u00fcn ya\u015fayan d\u00f6rt ayakl\u0131 hayvanlarda\u2014k\u00f6pek ve kediler gibi\u2014yava\u015f hareket s\u0131ras\u0131nda yayg\u0131n olarak kullan\u0131lan bir y\u00fcr\u00fcy\u00fc\u015f bi\u00e7imidir. Bu ke\u015fif, bu y\u00fcr\u00fcy\u00fc\u015f tarz\u0131n\u0131n omurgal\u0131 tarihinin \u00e7ok erken d\u00f6nemlerinde evrimle\u015fti\u011fini g\u00f6steriyor.<\/p>\n\n
Ayr\u0131ca, kum tepelerinde amniyot ayak izlerinin bulunmas\u0131, bu habitatlarda ya\u015fad\u0131klar\u0131 bilinen zaman \u00e7izelgesini en az 8 milyon y\u0131l geriye \u00e7ekiyor. Bu durum, erken omurgal\u0131lar\u0131n \u00e7e\u015fitlenmesine ve uyum sa\u011flamas\u0131na dair anlay\u0131\u015f\u0131m\u0131z\u0131 geni\u015fletiyor.<\/p>\n\n
Grand Canyon\u2019un paleontoloji program y\u00f6neticisi Mark Nebel, \u00e7al\u0131\u015fman\u0131n baz\u0131 sonu\u00e7lar\u0131n\u0131n\u2014\u00f6zellikle izlerin yorumlanmas\u0131 ve kaya\u00e7lar\u0131n ya\u015f\u0131 konusundaki \u00e7\u0131kar\u0131mlar\u0131n\u2014bilimsel tart\u0131\u015fmalara konu olabilece\u011fini belirtiyor. Ancak bu ke\u015ffin \u00e7evresindeki heyecan\u0131n alt\u0131n\u0131 \u00e7iziyor; \u00e7\u00fcnk\u00fc bu durum, prehistorik d\u00fcnyaya dair yeni bilgiler ortaya koyuyor ve erken omurgal\u0131 evrimi konusundaki anlay\u0131\u015f\u0131m\u0131za meydan okuyor.<\/p>\n\n
Grand Canyon\u2019da ke\u015ffedilen antik s\u00fcr\u00fcngen ayak izleri, \u00e7ok uzak ge\u00e7mi\u015fe a\u00e7\u0131lan bir pencere sunarak erken omurgal\u0131lar\u0131n k\u00f6kenleri ve davran\u0131\u015flar\u0131na dair de\u011ferli ipu\u00e7lar\u0131 sa\u011fl\u0131yor. \u00c7al\u0131\u015fma, bu b\u00fcy\u00fcleyici yarat\u0131klar hakk\u0131ndaki bilgimizi daha da zenginle\u015ftiren tart\u0131\u015fma ve ara\u015ft\u0131rmalara yol a\u00e7maya devam ediyor.<\/p>","protected":false},"excerpt":{"rendered":"
Grand Canyon\u2019da Prehistorik S\u00fcr\u00fcngen Ayak \u0130zleri G\u00fcn Y\u00fcz\u00fcne \u00c7\u0131kt\u0131 Ke\u015fif ve \u00d6nemi 2016 y\u0131l\u0131nda jeolog Allan Krill, Grand Canyon Ulusal Park\u0131\u2019ndaki Bright Angel Trail\u2019\u0131 ke\u015ffederken ilgi \u00e7ekici bir ke\u015fif yapt\u0131.…<\/p>\n","protected":false},"author":2,"featured_media":25183,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[244],"tags":[23635,19362,22340,137,23636,1561],"class_list":["post-18056","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-natural-history","tag-ancient-reptiles","tag-fossil-footprints","tag-grand-canyon","tag-paleontology","tag-prehistoric-discovery","tag-vertebrate-evolution"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/posts\/18056","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/comments?post=18056"}],"version-history":[{"count":2,"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/posts\/18056\/revisions"}],"predecessor-version":[{"id":25184,"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/posts\/18056\/revisions\/25184"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/media\/25183"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/media?parent=18056"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/categories?post=18056"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/tr\/wp-json\/wp\/v2\/tags?post=18056"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}