“金釘子”全稱為全球性界(jie)線層(ceng)型剖面(mian)(mian)(mian)和點(dian)位(wei),是(shi)年(nian)代(dai)地(di)層(ceng)系與系之(zhi)間(jian)的全球標準。長興煤山D剖面(mian)(mian)(mian)是(shi)地(di)球發(fa)展史(shi)較大的斷代(dai)界(jie)線層(ceng)型。1985年(nian),中國(guo)地(di)質大學(xue)教授張克信在D剖面(mian)(mian)(mian)27C之(zhi)底發(fa)現了牙形石化石,從而確立了該剖面(mian)(mian)(mian)的國(guo)際(ji)地(di)位(wei)。
這枚(mei)“金(jin)釘子(zi)”既是(shi)二疊系(xi)與(yu)三疊系(xi)的(de)界線,又是(shi)古生(sheng)代(dai)(dai)和中(zhong)生(sheng)代(dai)(dai)的(de)分界標(biao)志(zhi),是(shi)地質年(nian)代(dai)(dai)中(zhong)較(jiao)大的(de)3個斷代(dai)(dai)“金(jin)釘子(zi)”之一。它的(de)發(fa)現,代(dai)(dai)表著所在國(guo)地層研(yan)究(jiu)水平的(de)較(jiao)高科學(xue)榮譽。
長(chang)興(xing)地(di)(di)(di)質遺跡保(bao)護區位(wei)(wei)于(yu)長(chang)興(xing)媒(mei)山鎮與槐坎鄉的交界處,為長(chang)興(xing)灰巖剖(pou)面。1931年,美(mei)籍科學家葛利普以(yi)長(chang)興(xing)地(di)(di)(di)名將長(chang)興(xing)灰巖命名為"長(chang)興(xing)階",代(dai)表二疊系(xi)較(jiao)晚期的一個年代(dai)地(di)(di)(di)層(ceng)單(dan)位(wei)(wei),是一個以(yi)中國地(di)(di)(di)名命名的地(di)(di)(di)層(ceng)年代(dai)單(dan)位(wei)(wei)。
2001年3月,國際地科聯(lian)通過投(tou)票(piao),正式將(jiang)浙江(jiang)(jiang)長興(xing)灰巖的D剖面確定為全(quan)球二疊--三(san)疊系(xi)界(jie)線(xian)層型及點(俗稱"金釘子")。2005年9月3日,國際地科聯(lian)又在長興(xing)灰巖的同一剖面上確定了全(quan)球長興(xing)階底(di)界(jie)和吳家坪階頂界(jie)的接觸接線(xian)層型,這意味著浙江(jiang)(jiang)長興(xing)媒山(shan)在同一D剖面上擁有兩顆"金釘子"。
建筑面積約4000平(ping)方(fang)米的(de)(de)(de)地(di)(di)(di)(di)質博物(wu)館分為(wei)地(di)(di)(di)(di)球(qiu)(qiu)(qiu)奧秘廳(ting)(ting)、生(sheng)(sheng)(sheng)(sheng)(sheng)命(ming)(ming)演化廳(ting)(ting)、研礦(kuang)形成廳(ting)(ting)、"金釘子(zi)"展(zhan)(zhan)廳(ting)(ting)、長興(xing)(xing)古(gu)(gu)地(di)(di)(di)(di)理廳(ting)(ting)和科(ke)普演示廳(ting)(ting)6個展(zhan)(zhan)廳(ting)(ting)。將成為(wei)中(zhong)(zhong)(zhong)外(wai)地(di)(di)(di)(di)學專家(jia)科(ke)考(kao)的(de)(de)(de)神圣(sheng)殿(dian)堂,大專院校真實(shi)直觀的(de)(de)(de)實(shi)驗基地(di)(di)(di)(di),更是(shi)(shi)青(qing)少年科(ke)普教育的(de)(de)(de)大講壇。這(zhe)些展(zhan)(zhan)廳(ting)(ting)以圖文和古(gu)(gu)生(sheng)(sheng)(sheng)(sheng)(sheng)物(wu)化石(shi)標本等介紹地(di)(di)(di)(di)球(qiu)(qiu)(qiu)生(sheng)(sheng)(sheng)(sheng)(sheng)命(ming)(ming)的(de)(de)(de)起源(yuan),展(zhan)(zhan)示長興(xing)(xing)剖面中(zhong)(zhong)(zhong)各類化石(shi)實(shi)物(wu)和照片,并以二疊世(shi)晚期長興(xing)(xing)的(de)(de)(de)古(gu)(gu)地(di)(di)(di)(di)理環(huan)境(jing)為(wei)背景,模(mo)擬古(gu)(gu)生(sheng)(sheng)(sheng)(sheng)(sheng)物(wu)生(sheng)(sheng)(sheng)(sheng)(sheng)活(huo)場景及(ji)二疊--三疊紀時期古(gu)(gu)地(di)(di)(di)(di)理與(yu)古(gu)(gu)生(sheng)(sheng)(sheng)(sheng)(sheng)態景觀。在全館中(zhong)(zhong)(zhong),較有(you)意義(yi)的(de)(de)(de)藏品是(shi)(shi)一顆被放(fang)大的(de)(de)(de)牙(ya)形石(shi)模(mo)型,這(zhe)是(shi)(shi)一枚(mei)劃(hua)地(di)(di)(di)(di)球(qiu)(qiu)(qiu)時代(dai)(dai)(dai)(dai)意義(yi)的(de)(de)(de)標志性化石(shi),是(shi)(shi)2.5億年前古(gu)(gu)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai)(dai)(dai)(dai)與(yu)中(zhong)(zhong)(zhong)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai)(dai)(dai)(dai)的(de)(de)(de)界限標志,成了(le)各國(guo)科(ke)學家(jia)翻閱的(de)(de)(de)天書,被國(guo)際地(di)(di)(di)(di)科(ke)聯確(que)定為(wei)全球(qiu)(qiu)(qiu)較高級別(bie)的(de)(de)(de)金釘子(zi)。長興(xing)(xing)地(di)(di)(di)(di)質遺跡(ji)自然保護區所(suo)擁有(you)的(de)(de)(de)全球(qiu)(qiu)(qiu)"金釘子(zi)"是(shi)(shi)地(di)(di)(di)(di)球(qiu)(qiu)(qiu)史上3個較重要的(de)(de)(de)斷代(dai)(dai)(dai)(dai)界線(前古(gu)(gu)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai)(dai)(dai)(dai)--古(gu)(gu)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai)(dai)(dai)(dai),古(gu)(gu)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai)(dai)(dai)(dai)--中(zhong)(zhong)(zhong)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai)(dai)(dai)(dai),中(zhong)(zhong)(zhong)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai)(dai)(dai)(dai)--新(xin)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai)(dai)(dai)(dai))之一,即古(gu)(gu)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai)(dai)(dai)(dai)與(yu)中(zhong)(zhong)(zhong)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai)(dai)(dai)(dai)的(de)(de)(de)斷代(dai)(dai)(dai)(dai)界線;同時它又是(shi)(shi)地(di)(di)(di)(di)球(qiu)(qiu)(qiu)歷(li)史上5次生(sheng)(sheng)(sheng)(sheng)(sheng)物(wu)大絕(jue)(jue)滅(mie)中(zhong)(zhong)(zhong)較大一次絕(jue)(jue)滅(mie)事件和全球(qiu)(qiu)(qiu)變化相聯系的(de)(de)(de)點位(wei),具有(you)國(guo)際對比意義(yi)和極(ji)高的(de)(de)(de)科(ke)學研究(jiu)價值。