Okwamanje ngama-dinosaurs, ama-ammonite nawo aphela izigidi zeminyaka edlule. Bebehlala ezindaweni ezahlukahlukene zasolwandle futhi izinyathelo zabo zisatholakala ezindaweni ezahlukene emhlabeni.
Okwamanje ngama-dinosaurs, ama-ammonite nawo aphela izigidi zeminyaka edlule. Bebehlala ezindaweni ezahlukahlukene zasolwandle futhi izinyathelo zabo zisatholakala ezindaweni ezahlukene emhlabeni.
Lawa ma-cephalopods anegobolondo langaphandle abe nokuvela okusheshayo nokufushane. Babehlala kusukela eDevoniya, ngenkathi yePaleozoic, kuya eMesozoic. Ngenxa yokuguquguquka kwezakhi zofuzo, bakwazile ukuzivumelanisa nezimo zokuphila ezihlukile: okufanayo olwandle olujulile njengasolwandle oluvulekile nasezindaweni ezizungezwe umhlaba wezwekazi.
Njengamanje, izihlobo zabo eziseduze kakhulu zitholakala ezintweni eziphilayo ezinjenge-Argonauts neNautilus, kepha ngokungafani neyokuqala, abanakho ukutholakala okubanzi emhlabeni.
Esinye sezidalwa ezifundwa kakhulu ngama-paleontologists ngama-ammonite ngqo. Kubaphenyi basebenza njengesibonisi esihle kakhulu sesikhathi, ngakho-ke baziwa njengeRólexes of paleontology. Ngokunjalo, ngoba kungenzeka ukuthola izinsalela zazo zisakazeke emhlabeni wonke, ziyisethenjwa esifanelekile emhlabeni sezinhlobo zokuphila ezingekho. Ngaphezu kwalokho, ukuba khona kwayo okubanzi kusiza ososayensi ukwenza ukuxhumana phakathi kwamaphuzu ahlukahlukene eMhlabeni.
Uma ngesikhathi somuntu iminyaka eyisigidi iyinkathi enkulu kakhulu, ngesikhathi se-geological ilingana nesikhathi esifushane kakhulu. Lezi zinguquko eziba khona kusuka esigabeni esisodwa kuya kwesinye kuyizinkomba ezingajwayelekile zokuthola iminyaka yamatshe, ngoba lezi zingahlukaniswa kumarekhodi ashiywe ngama-ammonite, izinsalela zawo ezihambisana nemikhondo ekhombisa izimo ezithile zokuphila.
Izazi ze-paleontologists azinikezi inani eliqondile leminyaka, kepha kusukela ezifundweni zazo kungenzeka wazi ukuthi iziphi izidalwa ezahlala kuqala, yiziphi kamuva, nokuthi zihambisana nesigaba sini nezindawo.
Ngenxa yengcebo enkulu yamadwala aseMexico, kukhona izinsalela zalezi zidalwa ezisukela eminyakeni eyizigidi ezingama-320 kuye kweziyizigidi ezingama-65. Ukutadisha kwayo ezweni lethu kwenziwe ngezikhathi ezithile. Izifundo zokuqala ze-monographic ezakha isisekelo sesayensi mayelana nama-ammonite eMexico zikweleta umcwaningi waseSwitzerland uCarl Burckhardt. Kamuva kwalandela amaphrojekthi amanye amaJalimane, amaMelika kanye namaFrance.
Ekhulwini lama-20, uphenyo lososayensi abahlukahlukene lunikeze umfutho omusha kulo msebenzi, njengoba indawo enkulu yaseMexico isenezimfihlakalo eziningi, ngakho-ke izazi kusenokuningi okufanele zikubheke: kunamadwala asolwandle aseSierra Madre Oriental , eBaja California naseHuasteca, phakathi kwezinye izindawo.
Ukuthola ama-ammonite, sihlala siqala ezifundweni ezedlule, hhayi i-paleontology kuphela, kepha i-geology iyonke. Njengoba kunemephu yokwakheka komhlaba, iqembu labacwaningi liya enkundleni. Le mephu ingasetshenziselwa ukuba nesilinganiso sokuqala seminyaka yamatshe.
Kakade emhlabathini kukhethwa iqoqo lamatshe, lapho kuthathwa khona isampula. Ngemuva kokuchoboza itshe, izinsalela zitholakala; Kepha akusiyo kuphela indaba yokuhlukanisa amatshe, ukususa i-ammonite nokunganaki konke okunye, ngoba kuloluphenyo singathola izinsalela zezitshalo noma izinambuzane ezingenamgogodla eziveza amanye amamaki we-palaeoenveloal okumele ahlulwe ukuthola incazelo ye-panoramic.
Ngalesi sizathu, ngokujwayelekile, amaqembu okuhlola akhiwa yithimba lochwepheshe abahlukahlukene. Ngale ndlela, uchwepheshe ngamunye unikela ngolwazi lwakhe ukuze achaze izici ezithile zophenyo ngalunye.
Emkhakheni, ososayensi bathola izimpendulo ngenxa yendawo lapho kutholakala khona izinsalela, kepha futhi kuyiqiniso ukuthi uma ingekho, lokho futhi kuba yidatha, bese inselelo ukwazi ukuthi kungani kungekho zinsalela lapho.
Akukhona ukuthi amatshe awakhulumi, kepha ukuthi athule izigidi zeminyaka. Umbuzo ovame kakhulu phakathi kwabantu uthi: "Lokho kwenzelwa ini?" Abaphenyi babe sebengabantu abadumile ngokuchaza ukubaluleka kokuqonda imvelaphi nokuguqulwa kwempilo.
Ngenxa yombala nokuma kwawo, ama-amonite akhanga emehlweni. Ngaphandle kokuthi umthetho uvikela ifa le-paleontological, kwezinye izimakethe izinsalela zithengiswa njengemihlobiso futhi akubhekwa ukuthi lokhu kuthengiswa kubangela ukulahleka kwedatha ebalulekile yesayensi.
Umthombo: UMexico ongaziwa uNombolo 341 / Julayi 2005
