Meraška jama
Meraška jama je neobična geomorfološka struktura usječenu u padine, s desne strane od trajektnog pristaništa i sela Merag. Jama dobar je primjer urušne ponikve. U krškom reljefu to je jedan od najzanimljivijih oblika koji je posljedica procesa i na površini i u krškom podzemlju. Nastala je urušavanjem stropa velike podzemlje šupljine (spilje, jame ili kaverne). Urušavanje je moglo biti postupno ili inicirano potresom. Strme padine se naknadno oblikuju djelovanjem padinskih procesa: osipanja i odronjavanja, a tijekom intenzivnih padalina i spiranjem te jaruženjem. Na ove procese na dnu ponikve ukazuju i obilne nakupine kršja i kamenih blokova. Zbog oblika, dubine i zasjenjenosti u ponikvi vlada specifična mikroklima s modificiranom temperaturom zraka i povećanom vlažnošću zraka i tla pa je i vegetacija drugačija nego na okolnim padinama Cresa.
Izvor: Hrvatsko geomorfološko društvo
Zadaci
Prije nego zabilježite nalaz earth cache, morate poslati poruku s točnim odgovorima na pitanja. Bilježenje earth cachea trebate obaviti odmah nakon slanja odgovora. Izbrisat ću zapise bez odgovora. Kratke upute za uporabu: šaljem odgovore, a zatim bilježim earth cache. Ako se ne slažete s ovim zahtjevom, molimo vas da ne bilježite ovaj earth cache. Za detalje o zahtjevima za earth cache pogledajte ovde.
Odgovorite na tri pitanja:
- Opišite razliku između stijena na boku i dnu jame.
- Procijenite visinu jame.
- Objavljujte fotografije vas i jame u vašem zapisu. Slike s broda se prihvaćaju.
Meraška Pit
Meraška Pit (or Merag's pit) is an unusual geomorphological structure carved into a slope to the right of the ferry dock and village of Merag. The pit is a good example of a collapse sinkhole. In the karst relief, it is one of the most interesting forms that is the result of processes both on the surface and in the karst underground. It was created by the collapse of the ceiling of a large underground cavity (cave, pit or cavern). The collapse could have been gradual or initiated by an earthquake. Steep slopes are subsequently shaped by the erossion of slope processes: erosion and subsidence, and during intense rainfall, by washing and dredging. At the bottom of the sinkhole these processes caused abundant accumulations of rubble and stone blocks. Due to its shape, depth and shade, the pond has a specific microclimate with modified air temperature and increased air and soil humidity, so the vegetation is different than on the surrounding slopes of Cres.
Sources: Croatian Geomorphological Society
Logging tasks
Before you log the earth cache you have to send the correct answers to the questions. Reply via my profile. Logging the earth cache should be done right after sending the answers. I will delete the logs without answers. Brief instructions for use: I send answers and then I log the earth cache.
For details on earth cache requirements, see here.
Answer three questions:
- Describe the difference between the rocks on the side and the bottom of the pit.
- Estimate the height of the pit.
- Post photos of you and the pit in your post. Pictures from the ship are accepted.