Dissabte, 23 de novembre del 2024

Troben a la Tossa de Montbui el fòssil d’una estrella de mar de fa 48 milions d’anys, una peça única al país

|

- Publicitat -

Una estrella de mar fòssil de 48 milions d’anys d’antiguitat ha estat localitzada a la vessant nord de la Tossa de Montbui, a l’Anoia. L’expert en paleontologia Josep Llansana ha estat l’autor de la troballa i, segons apunta, “no es troben quasi mai estrelles fossilitzades senceres perquè els ossicles dels estel·làrids estan units per membranes musculars que es desintegren ràpidament en morir l’animal i les peces es dispersen”. Es tracta d’un exemplar de ‘Calliderma atagensis’, una estrella de mar fòssil, amb els ossicles solts però agrupats, fet que va fer possible recuperar-la completa. La peça té un alt valor paleontològic, ja que a Catalunya no n’hi ha cap d’igual i només se n’havien trobat peces parcials, però mai l’estrella íntegra.

L’estrella de mar fossilitzada trobada al terme municipal de Santa Margarida de Montbui fa uns 20 centímetres de diàmetre i consta de 580 peces repartides entre els seus cinc braços i les dues cares, la superior i la inferior, on hi havia la boca de l’animal. Per la manera com ha estat trobada, els investigadors han conclòs que l’estrella de mar va morir de mort natural o, en tot cas, no violenta. El seu cos va quedar enterrat en el fang del mar càlid on vivia sense desintegrar-se ni ser menjat per cap animal. Les seves parts toves van ser consumides per bacteris i altres organismes petits i les parts dures sedimentades al fons marí van iniciar el procés de fossilització.

Publicitat

La Tossa de Montbui era un mar càlid de clima tropical durant l’Eocè, el període geològic que comprèn el temps entre el final del Paleocè (fa 56,0 milions d’anys) i el principi de l’Oligocè (fa 33,9 milions d’anys). El mar de l’Anoia s’obria cap a Lleida i Aragó i tenia a prop la costa, cap a la zona de Vallbona d’Anoia. El biòleg anoienc Josep Castelltort explica que “era un mar de poca profunditat i temperatura càlida amb gran quantitat d’esculls coral·lins, un dels ecosistemes més rics en diversitat i nombre d’animals i algues com coralls, esponges, caragols de mar, eriçons, algues i estrelles de mar”. Segons ell, aquesta és la raó per la qual actualment l’Anoia i, especialment Montbui, és un territori tan ric en fòssils.

L’expert Josep Llansana ha fet entrega del fòssil a la Generalitat de Catalunya, amb la previsió que pugui establir un conveni de cessió amb l’Ajuntament de Santa Margarida de Montbui perquè es pugui exposar al públic properament.

Publicitat

Segueix-nos a:

Més notícies

194 COMMENTS

  1. … [Trackback]

    […] Information to that Topic: monrural.cat/2020/06/08/troben-a-la-tossa-de-montbui-el-fossil-duna-estrella-de-mar-de-fa-48-milions-danys-una-peca-unica-al-pais/ […]

  2. … [Trackback]

    […] Here you will find 33654 more Info on that Topic: monrural.cat/2020/06/08/troben-a-la-tossa-de-montbui-el-fossil-duna-estrella-de-mar-de-fa-48-milions-danys-una-peca-unica-al-pais/ […]

  3. نساء مسيار

    […]we like to honor many other world wide web websites around the web, even if they aren’t linked to us, by linking to them. Below are some webpages really worth checking out[…]

  4. concerta for sale

    […]we like to honor lots of other net internet sites around the internet, even though they aren’t linked to us, by linking to them. Beneath are some webpages really worth checking out[…]

  5. glock 27 gen 4 price

    […]we like to honor quite a few other web web pages around the net, even though they aren’t linked to us, by linking to them. Underneath are some webpages really worth checking out[…]

  6. Entertainment

    […]although websites we backlink to below are considerably not associated to ours, we really feel they may be essentially really worth a go by means of, so possess a look[…]

  7. Economics Assignment Help

    […]Wonderful story, reckoned we could combine some unrelated data, nevertheless truly really worth taking a look, whoa did a single find out about Mid East has got additional problerms at the same time […]

  8. Technology news

    […]Wonderful story, reckoned we could combine a handful of unrelated data, nevertheless seriously really worth taking a appear, whoa did one particular study about Mid East has got more problerms at the same time […]

  9. Private Investigator

    […]Wonderful story, reckoned we could combine a few unrelated information, nonetheless definitely worth taking a appear, whoa did 1 learn about Mid East has got a lot more problerms as well […]

  10. wmbet casino

    […]we prefer to honor several other net web-sites on the web, even when they aren’t linked to us, by linking to them. Under are some webpages really worth checking out[…]

  11. lonpao

    […]although web-sites we backlink to below are considerably not connected to ours, we really feel they are actually really worth a go by means of, so have a look[…]

  12. egypt education

    […]we prefer to honor quite a few other online web-sites around the internet, even if they aren’t linked to us, by linking to them. Beneath are some webpages worth checking out[…]

  13. Guns on Sale

    […]although web-sites we backlink to beneath are considerably not connected to ours, we really feel they may be in fact worth a go by means of, so have a look[…]

  14. Món ngon cần thơ

    […]Wonderful story, reckoned we could combine some unrelated information, nevertheless genuinely really worth taking a search, whoa did 1 study about Mid East has got far more problerms at the same time […]

  15. Phần mềm soạn nhạc

    […]Wonderful story, reckoned we could combine a handful of unrelated information, nonetheless really really worth taking a search, whoa did 1 discover about Mid East has got a lot more problerms at the same time […]

  16. Lifestyle

    […]we like to honor several other web web-sites around the web, even if they aren’t linked to us, by linking to them. Below are some webpages worth checking out[…]

Comments are closed.