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Uluwatu Beach Limestone EarthCache

Hidden : 8/11/2019
Difficulty:
2.5 out of 5
Terrain:
3 out of 5

Size: Size:   other (other)

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Geocache Description:


Indonesian:

Ini adalah pantai yang luar biasa, sering dikunjungi oleh peselancar dan berjemur. Saya yakin Anda tidak akan menyesali kunjungan Anda di sini hanya karena formasi geologi yang unik saja. Perhatikan, ada beberapa anak tangga yang harus Anda turuni dan naik ke pantai. Daerah ini mungkin juga tidak dapat diakses saat air pasang, jadi waspadalah.
Batu gamping:

Batu kapur terdiri dari kalsium karbonat (CaCO3). Itu terbentuk oleh aktivitas organisme laut pembentuk terumbu, khususnya alga berkapur, foraminiferans, spons, karang, dan / atau moluska. Setelah terangkat ke atas permukaan, erosi kimia dan fisik relatif cepat membentuk lanskap karakteristik. Karbon dioksida terlarut dalam air hujan dapat melarutkan kalsium dioksida. Ini dapat menghasilkan pembentukan gua dan juga formasi permukaan yang kasar seperti puncak, yang akan Anda lihat di lokasi ini. Erosi fisik dapat mengakibatkan pembentukan takikan pasang surut (abrasi takik) oleh pasir atau kerikil yang terbawa gelombang, yang menghasilkan penampilan bulat dan dipoles.
Formasi Geologi Bali:

Pulau Bali, seperti kebanyakan pulau di kepulauan Indonesia, adalah hasil dari subduksi tektonik lempeng Indo-Australia di bawah lempeng Eurasia. Dasar laut tersier, yang terbuat dari endapan laut purba termasuk akumulasi terumbu karang, terangkat di atas permukaan laut oleh subduksi. Lapisan batu kapur Tersier yang terangkat dari dasar samudra masih terlihat di daerah-daerah seperti Bukit semenanjung dengan tebing batu kapur besar Uluwatu, seperti tebing yang dapat Anda lihat di dekat lokasi ini dan Pura Uluwatu.

Deformasi lokal lempeng Eurasia yang diciptakan oleh subduksi telah mendorong kerak kerak, yang menyebabkan munculnya fenomena vulkanik. Sederetan gunung berapi melapisi bagian utara pulau itu, di poros Barat-Timur di mana bagian barat tertua, dan bagian timur terbaru. Gunung berapi tertinggi adalah gunung berapi strato-aktif Gunung Agung, pada 3.142 m (10.308 kaki).

Di tepi subduksi, Bali juga berada di tepi beting Sunda kontinental, tepat di sebelah barat garis Wallace, dan pada satu waktu terhubung ke pulau tetangga Jawa, terutama selama penurunan permukaan laut di dalam Es. Umur.
Pertanyaan:

1) Apa yang menyebabkan kalsium di dalam batu kapur larut? (Jawaban dapat ditemukan di halaman cache)

2) Pada koordinat earthcache Anda akan melihat takik pasang surut yang panjang di sepanjang dinding timur laut (Anda tidak bisa melewatkannya, itu cukup jelas), proses fisik apa yang menurut Anda menyebabkan takikan ini terbentuk di sepanjang dinding? Jelaskan apa yang Anda lihat.

3) Apa yang menyebabkan terbentuknya batu kapur saat masih di dasar laut? (Jawaban dapat ditemukan di halaman cache)

4) Pada Tahap 2 Anda akan melihat beberapa puncak kecil di dasar dinding tebing, menggambarkan penampilan mereka. Apakah Anda pikir air laut atau air hujan menyebabkan puncak ini terbentuk? (jawaban dapat ditemukan di halaman cache)

5) Berikan foto diri Anda, atau GPS Anda, atau kaki Anda, dll di lokasi earthcache. Ini WAJIB.

Sumber:

https://www.sciencedirect.com/topics/earth-and-planetary-sciences/limestone

https://en.wikipedia.org/wiki/History_of_Bali#Geological_formation

https://link.springer.com/chapter/10.1007%2F978-94-009-4215-8_12

English:

Earthcaches are meant to be educational so please put in a little effort to learn something new while doing this geocache.

This is a great beach, frequented by surfers and sunbathers. I believe you will not regret your visit here just because of the unique geological formations alone. Note, there quite a few stairs you will need to descend and ascend to get to the beach.The area may also not be accessible during high tides so be aware of this.

Limestone:

Limestone consists of calcium carbonate (CaCO3). It was formed by the activity of reef building marine organisms, in particular calcareous algae, foraminiferans, sponges, corals, and/or molluscs. After being lifted up above the surface, chemical and physical erosion relatively quickly form characteristic landscapes. Dissolved carbon dioxide in rain water can dissolve calcium dioxide. This can result in the forming of caves and also of rugged surface formations such as pinnacles, which you will see at this location. Physical erosion can result in the formation of tidal notches (abrasion notches) by wave-borne sand or gravel, which results in a rounded and polished appearance.

Geological Formation of Bali:

The island of Bali, like most of the islands of the Indonesian archipelago, is the result of the tectonic subduction of the Indo-Australian plate under the Eurasian plate. The tertiary ocean floor, made of ancient marine deposits including accumulation of coral reefs, was lifted above the sea level by the subduction. Layers of Tertiary limestone lifted from the ocean floor are still visible in areas such as the Bukit peninsula with the huge limestone cliffs of Uluwatu, such as the cliffs you can see near this location and Uluwatu Temple.

The local deformation of the Eurasian plate created by the subduction has encouraged the fissuring of the crust, leading to the appearance of volcanic phenomena. A string of volcanoes line the northern part of the island, in West-East axis along which the western part is oldest, and the eastern part newest. The highest volcano is the active strato-volcano Mount Agung, at 3,142 m (10,308 ft).

At the edge of the subduction, Bali is also at the edge of the continental Sunda shelf, just west of the Wallace line, and was at one time connected to the neighbouring island of Java, particularly during the lowering of the sea level in the Ice Ages.

Questions:

1) What causes calcium dioxide in limestone to dissolve? (Answer can be found on the cache page)

2) At the earthcache coordinates you will see a long tidal notch along the northeast wall (you can't miss it, it is quite obvious), what physical processes do you think caused this notch to form along the wall? Describe what you see.

3) What causes the formation of limestone while it is still on the ocean floor? (Answer can be found on cache page)

4) At Stage 2 you will see some small pinnacles at the base of the cliff wall, describe their appearance. Do you think the sea water or rain water caused these pinnacles to form? (answer can be found on the cache page)

5) Provide a photo of yourself, or your GPS, or your foot, etc at the earthcache location. This is MANDATORY.

 Sources:

https://www.sciencedirect.com/topics/earth-and-planetary-sciences/limestone

https://en.wikipedia.org/wiki/History_of_Bali#Geological_formation

https://link.springer.com/chapter/10.1007%2F978-94-009-4215-8_12

Additional Hints (No hints available.)