Amonit v Dolini triglavskih jezer
Amoniti so izumrla skupina morskih mehkužcev. V današnjih dneh jih najdemo v različnih kamnih, kot fosili iz preteklosti, nekaj takih fosilov je v Dolini triglavskih jezer.
Dolina Triglavskih jezer je močno zakrasela visokogorska alpska dolina v osrčju Julijskih Alp med Bohinjem in Trento, z jezeri, ki so nastala v kotanjah z vododržnimi usedlinami. Najnižji del 8 km dolge doline je na 1300 m nadmorske višine, zgornji na 2000 m. Spodnji del Doline Triglavskih jezer se imenuje Lopučniška dolina in je od osrednjega dela ločen s strmo stopnjo. Dolina ni znana le po jezerih, temveč tudi po dobro razvitih kraških pojavih, fosilih, bujnem rastlinstvu in živalstvu ter povesti o Zlatorogu. Že v obdobju prvega razcveta planinstva na Slovenskem je veljala za enega najlepših predelov Julijskih Alp. K temu je pripomogla tudi ena najstarejših planinskih postojank v slovenskih gorah, postavljena ob Dvojnem jezeru. Dolino so že leta 1924 zavarovali kot Alpski varstveni park. Glede na namen zavarovanja ta letnica velja kot letnica ustanovitve prvega slovenskega narodnega parka. Ime Triglavski narodni park je bilo prvič uporabljeno leta 1926, čeprav je sam vrh Triglava zavarovano območje parka zaobjelo šele po njegovi razširitvi leta 1981. Dolina je tudi naravna vrednota državnega pomena.
Mlajši jurski apnenci so značilne rdečkaste barve in slabo prepuščajo vodo. Pogosto so bogati s fosili, zlasti školjk in amonitov.
Raznolikost in starost morskih okolij, v katerih so nastajale kamnine, se odraža tudi v številnih, čudovito ohranjenih fosilnih ostankih. Ne redko kje v gorah narodnega parka se lahko obiskovalec sprehaja po morskem dnu, polnem školjk, polžev in morskih ježkov, občuduje pisan svet koralnih grebenov in zaplava skupaj z že dolgo izumrlimi amoniti.
Amoniti so izumrla skupina morskih živali, in sicer podrazred Ammonoidea v razredu Cephalopoda (glavonožci), deblo Mollusca (mehkužci). So odlični fosilni kazalniki in pogosto omogočijo povezati plast, v kateri so najdeni, s specifičnimi geološkimi časovnimi obdobji. Najbližji sorodnik amonitov najverjetneje ni sodobni (po videzu podobni) Nautilus, temveč podrazred Coleoidea (hobotnica, ligenj in sipa). Njihove fosilne lupine imajo navadno obliko planispiral, nekatere pa so tudi polžasto zavite ali niso spiralne. Po spiralni obliki so tudi dobili svoje ime, saj spominjajo na ovnove rogove.
Večina amonitov je bila majhna, nekateri pa so imeli premer do 2 metra. Bili so zelo pogost plen pleziozavrov in ihtiozavrov. Imeli so lupino, ki je bila pri večjih amonitih debela do 5 centimetrov. Imeli so od 20 do 1800 kratkih lovk, ki so bile luskinaste ali pa poraščene z zelo redkimi kocinami.
Večina Amonitov najdemo v apnencih, včasih pa jih lahko najdemo tudi v drugih kamnih.
Fosili so ostanki odmrlega organizma okamenelih rastlin in živali, ki so se ohranile v zemljini, sedimentu ali kamenini iz starejših geoloških obdobij. Po odmrtju se mora takšen organizem dovolj hitro znajti v primernem okolju, kjer je onemogočeno njegovo hitro razpadanje. Takšni pogoji so bili in so še danes v raznih močvirjih, blatu, mulju, pesku, vulkanskem pesku, vulkanskem pepelu, smoli, zemeljskem vosku, katranu in podobnem. Primerno okolje sproži dolgotrajen fizikalno-kemičen proces, v katerem se odmrli organizem spremeni v fosil. Takšen proces imenujemo fosilizacija. Fosilizacija lahko poteka na več načinov, ki pripeljejo do različnih oblik fosilov.
V kamnu Koče pri triglavskih jezerih lahko najdete Amonita na vzhodni steni v višini približno 2m.
Za vpis zaklada, kot najdenega odgovorite na spodnja vprašanja in mi odgovore posredujete preko GC profila, vendar ni potrebno čakati na moj odgovor, da bi zaklad označili kot najden.
Vprašanja:
1. Poglej amonit, ali je ta okamenelost ali je to ostanek živali?
2. Primerjaj kamen v notranjosti amonita s kamnom okoli njega.
Neobvezno:
1. Vpisu lahko priložite tudi fotografije.
Ammonit in Triglav Lakes Valley
Ammonites are an extinct group of marine mollusk animals in the subclass Ammonoidea of the class Cephalopoda. In now a days they can be found in different stones like a fossils from a past.
The Valley of the Triglav Lakes or the Seven Lakes Valley is an Alpine glacial valley. The valley itself is the result of the mighty overthrust of the Slatna plate, whereas the formation of the lakes on the karstified ground was enabled by the impermeable sediments. The Valley of the Triglav Lakes, which has been protected as a national park since 1924, boasts a varied terrain, interesting flora and fauna, fossils and Alpine animals. The Valley is also known for its well-developed karst phenomena and the story of Zlatorog. With its little lakes and ponds, this karstified valley is a photographer's paradise.
Reddish Jurassic limestones contain fossilized shells of ammonites (marine molluscs from the Jurassic which started becoming extinct 100 million years ago for unknown reason) measuring up to 20cm.
It is prohibited to bathe or carry out any other recreational activities in the lakes. If not for the law, respect the ban because you know it is the right thing to do. Leave no permanent traces behind, i.e. bring all the trash from the mountains to properly dispose of them in the valley.
Ammonites are an extinct group of marine animals belonging to the cephalopod subclass Ammonoidea. They lives from the Devonian until Late Cretaceous (417 - 65 million years ago) all over the world. Today living near relatives are coleoids, squid, octopus, and cuttlefish. Their name came from their spiral shape somewhat resemble tightly-coiled rams horns like the egyptian godhood Ammon.
The soft body of the creature occupied the largest segments of the shell at the end of the coil. The smaller earlier segments were walled off and the animal could maintain its buoyancy by filling them with gas. The shifting achieve by repulsion power.
They are main index fossils, and it is often possible to link the rock layer in which they are found to specific geological time periods. About 30.000 - 40.000 species are assumed. Therefore the ammonites are very important for geology.
The most of the Ammonites are found in limestone, but sometime they can be found also in marmor and other stones.
Fossils are most commonly found within sedimentary rocks due to the favorable conditions of burial and limited alteration through time. Sedimentary rocks form on the Earth's surface as sediment accumulates in rivers, lakes and on the seafloor in particular. Among the common sedimentary rocks include: sandstone, composed predominantly of grains of eroded rock; limestone, composed predominantly of shell debris and planktonic skeletons; and shale, formed from hardened clay (originally deposited as mud).
On very rare occasions fossils can also be found within igneous rocks where molten rock escapes to the Earth's surface and envelops organisms in its path, such as a tree. In this example if the molten rock cools and hardens in less time than it takes to turn the tree to ash, then the hardened rock may form a solid mould around the tree. Over a short period of time the tree tissues decay leaving an empty chamber inside the rock, some examples even preserve the texture of the outer bark on the walls of the mould.
You can find Amonite on the east wall of Hut about 2m high.
Here are the questions necessary for logging this cache as found. Please send the reply through the contact form, but do not wait for my reply, log right away.
Question:
1. Take a look of an Ammonites. Do you think that it is fossilized or you can see there remainings of an organism?
2. Compere stone inside the amonit with the stone around it.
Optional:
1. If you want you can make some photos and add them to your log.
