“金釘子”全(quan)稱為(wei)全(quan)球(qiu)性界線層型(xing)剖面(mian)和點(dian)位,是年代地層系與(yu)系之間的(de)全(quan)球(qiu)標準。長興(xing)煤山D剖面(mian)是地球(qiu)發(fa)展史較大(da)的(de)斷代界線層型(xing)。1985年,中國地質大(da)學教授張克信在D剖面(mian)27C之底發(fa)現了(le)牙形(xing)石化(hua)石,從而確立(li)了(le)該剖面(mian)的(de)國際(ji)地位。
這枚(mei)“金(jin)釘(ding)子(zi)”既是二疊系與三(san)疊系的界線,又是古生代和(he)中生代的分(fen)界標志(zhi),是地質(zhi)年代中較(jiao)大的3個斷代“金(jin)釘(ding)子(zi)”之一。它(ta)的發現(xian),代表著(zhu)所在(zai)國地層研究水(shui)平(ping)的較(jiao)高科學榮譽。
長興(xing)地(di)質遺跡保護(hu)區位于(yu)長興(xing)媒山鎮與槐(huai)坎鄉的(de)交(jiao)界處,為長興(xing)灰巖剖面。1931年(nian),美籍科(ke)學家(jia)葛利普以長興(xing)地(di)名(ming)將長興(xing)灰巖命(ming)名(ming)為"長興(xing)階(jie)",代表(biao)二疊系較晚期的(de)一(yi)個(ge)年(nian)代地(di)層(ceng)單位,是一(yi)個(ge)以中國(guo)地(di)名(ming)命(ming)名(ming)的(de)地(di)層(ceng)年(nian)代單位。
2001年3月(yue),國際地(di)(di)科聯通(tong)過投票,正(zheng)式(shi)將浙(zhe)江(jiang)長興(xing)(xing)(xing)灰(hui)巖(yan)的D剖面(mian)確定(ding)為全球(qiu)二(er)疊(die)--三(san)疊(die)系(xi)界(jie)線層型(xing)及點(俗(su)稱"金釘子(zi)")。2005年9月(yue)3日,國際地(di)(di)科聯又在長興(xing)(xing)(xing)灰(hui)巖(yan)的同(tong)一剖面(mian)上確定(ding)了全球(qiu)長興(xing)(xing)(xing)階底界(jie)和吳(wu)家(jia)坪階頂界(jie)的接觸(chu)接線層型(xing),這意(yi)味著浙(zhe)江(jiang)長興(xing)(xing)(xing)媒山在同(tong)一D剖面(mian)上擁有兩顆"金釘子(zi)"。
建筑(zhu)面(mian)積約4000平(ping)方米(mi)的(de)(de)(de)地(di)(di)(di)(di)(di)(di)質博物(wu)(wu)館(guan)分為地(di)(di)(di)(di)(di)(di)球(qiu)(qiu)奧秘廳(ting)、生(sheng)(sheng)(sheng)(sheng)(sheng)命(ming)(ming)演化(hua)廳(ting)、研(yan)礦形成廳(ting)、"金釘子"展(zhan)廳(ting)、長(chang)興(xing)(xing)古(gu)(gu)地(di)(di)(di)(di)(di)(di)理(li)廳(ting)和科(ke)普(pu)演示廳(ting)6個展(zhan)廳(ting)。將成為中(zhong)外地(di)(di)(di)(di)(di)(di)學專家(jia)科(ke)考的(de)(de)(de)神圣殿堂,大(da)(da)專院校真實直觀的(de)(de)(de)實驗基地(di)(di)(di)(di)(di)(di),更是(shi)青少(shao)年科(ke)普(pu)教(jiao)育(yu)的(de)(de)(de)大(da)(da)講壇。這(zhe)些展(zhan)廳(ting)以(yi)圖文和古(gu)(gu)生(sheng)(sheng)(sheng)(sheng)(sheng)物(wu)(wu)化(hua)石(shi)標本等(deng)介紹(shao)地(di)(di)(di)(di)(di)(di)球(qiu)(qiu)生(sheng)(sheng)(sheng)(sheng)(sheng)命(ming)(ming)的(de)(de)(de)起源,展(zhan)示長(chang)興(xing)(xing)剖(pou)面(mian)中(zhong)各類化(hua)石(shi)實物(wu)(wu)和照片(pian),并以(yi)二疊世(shi)晚期長(chang)興(xing)(xing)的(de)(de)(de)古(gu)(gu)地(di)(di)(di)(di)(di)(di)理(li)環境為背景(jing)(jing),模(mo)擬古(gu)(gu)生(sheng)(sheng)(sheng)(sheng)(sheng)物(wu)(wu)生(sheng)(sheng)(sheng)(sheng)(sheng)活場景(jing)(jing)及二疊--三疊紀時(shi)(shi)期古(gu)(gu)地(di)(di)(di)(di)(di)(di)理(li)與古(gu)(gu)生(sheng)(sheng)(sheng)(sheng)(sheng)態景(jing)(jing)觀。在全館(guan)中(zhong),較(jiao)有(you)意(yi)義(yi)的(de)(de)(de)藏(zang)品是(shi)一顆被(bei)(bei)放大(da)(da)的(de)(de)(de)牙(ya)形石(shi)模(mo)型,這(zhe)是(shi)一枚劃地(di)(di)(di)(di)(di)(di)球(qiu)(qiu)時(shi)(shi)代(dai)意(yi)義(yi)的(de)(de)(de)標志性(xing)化(hua)石(shi),是(shi)2.5億年前古(gu)(gu)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai)與中(zhong)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai)的(de)(de)(de)界限標志,成了各國科(ke)學家(jia)翻閱的(de)(de)(de)天(tian)書,被(bei)(bei)國際地(di)(di)(di)(di)(di)(di)科(ke)聯(lian)(lian)確定為全球(qiu)(qiu)較(jiao)高級別的(de)(de)(de)金釘子。長(chang)興(xing)(xing)地(di)(di)(di)(di)(di)(di)質遺跡自(zi)然保護區所擁有(you)的(de)(de)(de)全球(qiu)(qiu)"金釘子"是(shi)地(di)(di)(di)(di)(di)(di)球(qiu)(qiu)史(shi)(shi)上3個較(jiao)重要(yao)的(de)(de)(de)斷代(dai)界線(前古(gu)(gu)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai)--古(gu)(gu)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai),古(gu)(gu)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai)--中(zhong)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai),中(zhong)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai)--新生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai))之一,即古(gu)(gu)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai)與中(zhong)生(sheng)(sheng)(sheng)(sheng)(sheng)代(dai)的(de)(de)(de)斷代(dai)界線;同(tong)時(shi)(shi)它又是(shi)地(di)(di)(di)(di)(di)(di)球(qiu)(qiu)歷史(shi)(shi)上5次(ci)生(sheng)(sheng)(sheng)(sheng)(sheng)物(wu)(wu)大(da)(da)絕滅(mie)中(zhong)較(jiao)大(da)(da)一次(ci)絕滅(mie)事(shi)件和全球(qiu)(qiu)變化(hua)相聯(lian)(lian)系(xi)的(de)(de)(de)點(dian)位,具有(you)國際對(dui)比意(yi)義(yi)和極高的(de)(de)(de)科(ke)學研(yan)究(jiu)價值。