Dutsen Mussel

Mussel Rock wani dutse ne a bakin tekun San Mateo County, California, daga Daly City. Ya ƙunshi manyan duwatsu masu yawa na irin wannan da aka sani da tarin, inda aka rushe wani dutse ba daidai ba, yana barin ƙananan tsibirai. Dutse da kansa yana da mita 15 daga bakin tekun Mussel Rock Park kuma yana da tsawon mita 18.

Yankin bakin teku da ke kusa da dutsen shine Mussel Rock Park, wanda ya ƙunshi kadada 250 na ƙasar da ke kan iyakar bakin teku. Gidan shakatawa ya haɗa da yankin rairayin bakin teku, filin kaddamarwa, hanyoyin tafiya, da filin ajiye motoci.

An fi saninsa da kasancewa mafi kusa da cibiyar Girgizar kasa ta 1906 a San Francisco, kuma inda San Andreas Fault ya shiga Yankin San Francisco daga arewa maso yamma. An gano wani karamin kuskure, Mussel Rock Fault, a cikin 2000. 

Yankin da ke sama da Mussel Rock ya ƙunshi tsaunuka masu tsawo tare da rushewar ƙasa akai-akai, barazanar gidaje a cikin wani yanki a sama.

 Ilimin ƙasa 

 Halitta na Tsarin Mussel Rock 
Tsarin Mussel Rock da kansa tarin teku ne na zamanin Cretaceous, daga dutsen Franciscan Complex, wanda aka tsara shekaru 80 zuwa 90 da suka gabata. Ya bambanta da dutsen da ke kusa da shi na shekaru miliyan 3 na Merced Formation, basalt na ruwa wanda ya ƙunshi greenstone na Mussel Rock Formation daga hadaddun Franciscan ya fi tsayayya da dakarun rushewa.  

Mussel Rock ya fara fitowa ne a kusa da shekaru miliyan 145 da suka gabata lokacin da motsi daga Pacific Plate ya tilasta Farallon Plate kudu maso gabas, ya ragu a ƙarƙashin yammacin Arewacin Amurka Plate. subducting ya yanke saman farantin Farallon, kuma dutsen da aka yanke ya tara tare da Farallon Plate.

John McPhee ya fara littafinsa na 1993, Assembling California, tare da Mussel Rock . A cewar McPhee,


 Geology na mafi girman yankin bakin teku na Mussel Rock 
Yankin bakin teku da ke kewaye da Mussel Rock yana a wurin haɗuwa da tsarin ƙasa da yawa. Kashi mafi ƙasƙanci na Tsarin Merced yana ba da sandstone na ruwa zuwa yankin,  wanda aka ajiye a can shekaru miliyan 2-3 da suka gabata. Sashe na tsarin Merced a Mussel Rock yana daga cikin tsofaffin ajiyar sedimentary, mai zurfi a cikin shelf na nahiyar, wanda aka tura zuwa farfajiya ta hanyar lalacewa.

Dutsen Merced ya bambanta da dutsen kore na Franciscan Complex. Wadannan gine-ginen dutse guda biyu sun rabu a farfajiyar ta hanyar San Andreas Fault. A arewa maso gabas, wani nau'i mai laushi na tsarin Colma ya rufe Merced.

 Rushewa da rushewar ƙasa 
Saboda rushewar ƙasa, aikin girgizar ƙasa, da yanayin da ba shi da kyau na tsarin Colma da Merced na gida, yankin yanki ne mai aiki. A lokacin shekarun ENSO, Rushewar bakin teku a kan tsarin Merced da Colma na iya kaiwa matsakaici har zuwa 2 zuwa 3 feet a kowace shekara.   Baya ga rushewa ta hanyar raƙuman ruwa da iskõki, motsi tare da San Andreas Fault da Mussel Rock da kuma gini tare da tsaunuka suna taimakawa ga rushewar a yankin, suna kara haɗarin rushewar ƙasa.

 Muhalli 
Baƙi na Mussel Rock na iya girbe mussels, amma kawai a lokacin da aka amince da shi kuma tare da jagora daga Ma'aikatar Lafiya ta Jama'a ta California. Ma'aikatar Lafiya ta Jama'a ta California a kai a kai tana gwada guba ta shellfish da kuma sanya bayanan ba da shawara a shafin yanar gizon ta. 

 Tarihi 
Ginin farko da aka rubuta a Mussel Rock shine Ompuromo (wurin tsuntsaye na teku) wanda ƙabilar Yelamu na mutanen Ohlone ke zaune.   Dangane da kwanan wata na carbon na binciken archaeological daga wani tsakiya da aka tono a Mussel Rock, an kiyasta ƙauyen ya koma kusan 1500 AD, kodayake an san mutanen Ohlone sun zauna a yankin San Mateo tun aƙalla shekaru 5,000 da suka gabata, kuma sun kasance har zuwa mulkin mallaka na Spain a cikin 1776.

A shekara ta 1978, an tono midden kuma an gano cewa yana dauke da kayan tarihi ciki har da tarkace daga masana'antar kayan aiki da kuma ragowar dabbobi daga kayan abinci. Abin takaici, an tono mita 45 kawai kafin Daly City ta fara gina wurin rarraba shara, Mussel Rock Transfer Station, a saman tsakiyar. An yi amfani da yankin da ke kusa da shi a matsayin wurin zubar da shara daga 1958 zuwa 1978, yana hana duk wani binciken archaeological da ke kusa.


 Manazarta 

Rukuni:Shafuka masu fassarorin da ba'a duba ba