阿巴克运动;海西运动Arbuckle阿般火山岩albanistone阿贝折射计Abberefractometer阿布沙玄武岩absarokite阿当运动Ardennic阿丁斯克期〔二叠纪〕Artinskianage阿丁新克〔早二叠纪〕Artinskian阿尔卑斯地槽Alpinegeosyncline阿尔卑斯三叠系AlpineTriassicsystem(Alpinetriassysystem)阿尔卑斯闪岩带Alpineamphibolitezone阿尔卑斯式脉Alpinetypevein阿尔卑斯式褶皱Alpinetypeoffolding阿尔卑斯型褶皱Alpinefold阿尔卑斯造山运动Alpineorogeny阿尔必世〔中期白堊纪〕Albian阿尔冈纹造山运动Algomanorogeny阿尔帕三叠系systemtriassiquealpin阿夫顿间冰期Aftonian-interglacialstage阿富汗蜓Afghanella阿克殿期Acadian阿克殿造山运动AcadianOrogeny阿拉伯沙漠Arabiandesert阿莱干尼〔晚期石炭纪〕Allegheny阿力山得统〔早志留纪〕Alexandrian阿利尼克〔早奥陶纪〕Arenigian阿马逊古陆Amazonia阿门虫Ammonia阿摩力运动〔古生代后期〕Armorican阿姆塞石Amssacia阿帕拉阡〔古陆〕Appalachia阿帕拉阡造山运动Appalachianmovement阿普第〔早期白堊纪〕Aptian阿啟坦〔新生代〕Aquitanian阿斯蒂〔第三纪〕Astian阿斯突里运动〔晚石炭纪〕Asturian阿提克运动〔中新世后期〕Attic阿西极〔晚期上奥陶系〕Ashgillian阿席林〔旧石器时代〕Azilian埃及碧石Egyptianjasper(agate)矮小动物群depauoeratefa